Every position, browsable
Train
Checkmates
Force mate with K+Q, K+R, two bishops, and bishop + knight.
King & Queen Checkmate
White to play and win
King & Rook Checkmate
White to play and win
Two-Rook Ladder Mate
White to play and win
Bishop and Knight Mate: The Final Corner
White to play and win
Two Minor Pieces: The W-Maneuver
White to play and win
Two Bishops Checkmate
White to play and win
PRO
Bishop & Knight Checkmate
White to play and win
PRO
Kling and Horwitz: Two Bishops Against a Knight
White to play and win
King & pawn
Opposition, key squares, the square rule and the breakthrough.
Opposition: King Before Pawn
White to play and win
The Square of the Pawn
Black to play and draw
The Rook Pawn Corner Fortress
Black to play and draw
Take the Opposition to Hold the Draw
Black to play and draw
King on the Sixth: The Winning Formation
White to play and win
The Rule of the Square: Outrunning the King
White to play and win
The Pawn That Never Moves
White to play and draw
Queen Beats the Center Pawn
White to play and win
Reciprocal Zugzwang: e6 Against c5
White to play and win
The Same Position, and Only One Move Saves It
Black to play and draw
The Bishop Pawn Escapes
White to play and draw
When the Bishop Pawn Loses Anyway
White to play and win
Let the Rook Pawn Queen, Then Mate
White to play and win
The Pendulum Defense
White to play and draw
The King's Zigzag
White to play and win
Zigzag Around the Check
White to play and draw
Key Squares: The Winning Map
White to play and win
King and Two Pawns vs King
White to play and win
Defending King & Pawn vs King
Black to play and draw
Distant Opposition and Outflanking
White to play and win
The Opposition Is Worthless Without an Outflank
Black to play and draw
One Reserve Tempo Wins the Opposition
White to play and win
Opposition With Room: The d5 Breakthrough
White to play and win
Give Both Pawns Away to Save the Game
White to play and draw
Corresponding Squares: One Move Holds, Six Lose
Black to play and draw
Grigoriev 1920: Two Spare Tempi and a Stalemate
White to play and draw
Killing the Reserve Tempo: f and h vs the h-Pawn
Black to play and win
Reciprocal Zugzwang: One Tempo Draws
White to play and draw
One Tempo Short: g and h vs the h-Pawn
White to play and draw
g and h Against the h-Pawn: The Winning Half
White to play and win
Triangulation: Losing a Move to Win
White to play and win
Corresponding Squares Behind the Passed Pawn
White to play and win
The Stalemate That Saves
Black to play and draw
Corresponding Squares: Dedrle's Draw
Black to play and draw
The Wing Pawn Is Bait
White to play and win
Fix the Pawns and Draw
Black to play and draw
The Tempo Count Decides
White to play and win
The Extra Pawn That Cannot Win
Black to play and draw
The Outside Passed Pawn
White to play and win
Two Pawns Against One
White to play and win
The Reti Manoeuvre
White to play and draw
Shouldering: Winning the King Race
White to play and win
The Protected Passed Pawn
White to play and win
The Breakthrough
White to play and win
Separated Passers: The Floating Square
White to play and win
Winning the Pawn Race
White to play and win
Blocked Pawns: Racing for the Key Squares
White to play and win
Separated Pawns Defend Each Other
White to play and win
Doubled Pawns Against a Bare King
White to play and win
PRO
Inside the Square and Still Too Slow
White to play and win
PRO
Stop the Runner First, Then Queen
White to play and win
PRO
Mined Squares: c4 and b6
White to play and draw
PRO
Winning with a Frozen King
White to play and win
PRO
The Bishop Sacrifice That Buries a King
White to play and win
PRO
The Floating Square: When One Pawn Must Queen
Black to play and win
PRO
The Floating Square That Falls Short
Black to play and draw
PRO
Two Files Apart: The King Wins Both Pawns
White to play and win
PRO
Three Connected Pawns and the One Square That Wins
White to play and win
PRO
Two Passers and a King on a Leash
White to play and win
PRO
Leaving the Box at the Right Moment
White to play and win
PRO
Winning by Zugzwang
White to play and win
PRO
Triangulation: Losing a Move to Win
White to play and win
PRO
Corresponding Squares
White to play and win
PRO
Mined Squares
White to play and win
PRO
Winning the Queening Race with a Check
White to play and win
PRO
Two Rook Pawns and a Distant Passer
White to play and win
PRO
A Central Passer Beside Blocked Rook Pawns
White to play and win
PRO
A Bishop Pawn Beside Blocked Rook Pawns
White to play and win
Knight endgames
The knight stopping a pawn, and knight-pawn vs knight.
The Knight Blockade
Black to play and draw
Knight vs Rook Pawn
White to play and draw
The Knight Mates the King in the Corner
White to play and win
A Lone Knight Mates in the Corner
White to play and win
The King Locked in Front of Its Pawn
Black to play and draw
The Knight Catches the Runner
White to play and draw
Offer the Knight in the Corner
White to play and draw
Deflect the Blockader, Run the Rook Pawn
White to play and win
Stopping the Rook Pawn With Check
Black to play and draw
Sacrifice to Clear the Pawn's Path
White to play and win
Defend the Passed Pawn From Behind
White to play and win
The Knight Guards the Blockaded Pawn
White to play and win
The Knight's Pawn Exception
Black to play and win
King and Knight Mate the King Trapped by Its Own Pawn
White to play and win
PRO
Two Knights Cage the King
White to play and draw
PRO
Locked Rook Pawns, Spare Pawn
Black to play and draw
PRO
Knight and Pawn vs Knight
White to play and win
PRO
Choosing the Barrier Square with King Support
White to play and draw
PRO
Lateral Control of the Promotion Square
White to play and draw
PRO
The Knight's Worst Square
White to play and win
PRO
Knight Holds Two Connected Pawns
White to play and draw
Bishop endgames
Same-color bishops, the wrong bishop and Centurini.
The Wrong Bishop
Black to play and draw
Centurini: Deflect, Then Interfere
White to play and win
The King Guards the Interference Square
Black to play and draw
The Short Diagonal
White to play and win
The Wrong Bishop Draw
Black to play and draw
The Cutoff That Arrives One Tempo Late
White to play and draw
Cutting the King Off With the Bishop
White to play and win
The Bishop Buried on h7
White to play and draw
Connected Pawns Against the Long Diagonal
White to play and draw
Do Not Put the King In Front of the Pawns
Black to play and draw
Locked Knight Pawns Hold
White to play and draw
Blocked Rook Pawns and Stalemate
White to play and draw
King Behind King
Black to play and draw
The Position Janowsky Resigned
Black to play and draw
Driving Off the Lone Bishop
White to play and win
The Frontal Defence
Black to play and draw
Bishop Holds Two Connected Pawns
White to play and draw
PRO
The Torn Bishop and the Saving Sacrifice
White to play and draw
PRO
Only the King Can Take That Pawn
White to play and win
PRO
Give the g-Pawn Away
White to play and win
PRO
Centurini: Same-Colored Bishops
White to play and win
PRO
The Wrong Bishop's Bodyguard Pawn
White to play and win
PRO
Rear Opposition Holds
White to play and draw
PRO
The Three-Square Diagonal
White to play and win
Bishop vs knight
Good bishop vs bad knight, and the piece fortresses.
Win It by Zugzwang, Not by Pushing
White to play and win
Keep the Knight Away From the King
White to play and draw
Cutting the Knight Off with the Bishop
White to play and win
Only Be8 Stops the Pawn
Black to play and draw
Count the Diagonal, Then Block It
White to play and win
The Defending King Arrives in Time
White to play and draw
One Tempo Turns the Draw into a Win
White to play and win
Pawn on the Seventh: Zugzwang, Not a Chase
White to play and win
PRO
Good Bishop vs Bad Knight
White to play and win
PRO
When the Bishop's Diagonal Is Too Short
White to play and win
PRO
The Rook Pawn: A Draw in the Corner
White to play and draw
PRO
The Knight Blockade vs Bishop and Pawn
Black to play and draw
PRO
The Bishop's Long Diagonal vs Knight and Pawn
Black to play and draw
PRO
Knight & Pawn vs Bishop
White to play and win
PRO
Knight Holds vs Bishop & Pawn
White to play and draw
Opposite bishops
The great drawing tendency and the two-pawn exception.
PRO
Guard e6, But From the Right Square
Black to play and draw
PRO
Connected Passers Do Beat an Opposite-Coloured Bishop
White to play and win
PRO
Bf8, Then Give the Bishop for a Pawn
Black to play and draw
PRO
March at the Piece That Holds the Pawn
White to play and win
PRO
Same Pawns, Swapped Defenders, No Win
White to play and draw
PRO
The Knight's Pawn Saves the Draw
White to play and draw
PRO
The Opposite-Colored Bishops Fortress
Black to play and draw
PRO
Opposite Bishops: Two Pawns Win
White to play and win
PRO
Opposite Bishops: The Defensive Draw
White to play and draw
PRO
Beat the Wrong-Diagonal Bishop
White to play and win
PRO
Rook and Knight Pawns: Wait on the Long Diagonal
Black to play and draw
PRO
Race to the Fortress
Black to play and draw
PRO
The Cage
White to play and win
PRO
One File Apart: The King Blockade Holds
Black to play and draw
PRO
When the Attacker Owns the Corner
White to play and win
PRO
Central and Rook Pawn: Deny b7
Black to play and draw
PRO
The Overextended Knight Pawn
Black to play and draw
PRO
Knight Pawn Kept Back: Two Threats at Once
White to play and win
PRO
Outflanking with a- and e-Pawns
White to play and win
Rook endgames
Lucena, Philidor, Vancura and cutting off the king.
Rook vs Advanced Pawn
White to play and win
The Lucena Position
White to play and win
The Philidor Position
Black to play and draw
The Passive Back-Rank Defense
Black to play and draw
Cutting Off the King
White to play and win
Cutting the King Off: Rook Against a Runner
White to play and win
Rook vs Rook-Pawn: The Defender's Tempo
Black to play and draw
Cutting Off a Knight-Pawn
White to play and win
The Lone f-Pawn Falls Short
White to play and draw
Outflanking: The Réti Study
White to play and win
Pawn on the Seventh: Building the Bridge
White to play and win
Where the Side Checks Run Out
White to play and win
The Knight Underpromotion Defense
White to play and draw
When the Knight Trick Fails
White to play and win
Rook Against Connected Pawns
White to play and draw
Connected Passers: Shelter Behind Your Own Pawn
White to play and win
The Rook Belongs Behind the Leading Pawn
White to play and win
Rook Against Separated Pawns
White to play and draw
Three Files Apart: The Rook Is Overloaded
Black to play and win
Separated Passers Overrun the Rook
Black to play and win
Shouldering Off the King
White to play and draw
The Check That Buys a Tempo
White to play and win
The Stalemate Resource
Black to play and draw
King Trapped in Front of the Rook Pawn
White to play and draw
Freeing the King From Its Own Rook Pawn
White to play and win
The Frontal Attack: A Pawn Short of the Mid-Line
White to play and draw
The Far Rook Still Holds
White to play and draw
Rook on the First Rank, King to the Rescue
White to play and draw
Cut, Shoulder, Check, Push
White to play and win
One Tempo Saves the Draw: Only Kd5
Black to play and draw
Cut Off by Two Files: King First, Pawn Last
White to play and win
Zugzwang Against a King on the Edge
White to play and win
Knight Pawn: Two Files of Cut Is Not Enough
White to play and draw
Philidor's Defense on the Fifth
Black to play and draw
The Fifth-Rank Fortress: 1.Kf6 Does Not Win
White to play and draw
Rook Behind the Pawn, King to the Side
Black to play and draw
Knight Pawn: The Long Side or Nothing
Black to play and draw
Pawn on the Sixth: The Rook Goes to h7
White to play and win
Holding the Sixth-Rank Pawn
Black to play and draw
The Wrong Side of the Pawn
White to play and draw
A Drawn Pawn on the Sixth
White to play and draw
Pawn on the Sixth: the King Steps to e8
White to play and win
Pawn on the Sixth: Only Ra7+ Holds
Black to play and draw
The Rook Too Close to the Pawn
White to play and win
Rook Behind the Pawn, King to e8
White to play and win
The Vancura Position
Black to play and draw
One Tempo Too Late for Vancura
Black to play and draw
The Standard Draw: Rook in Front of the Pawn on the Seventh
White to play and draw
Rook Behind the Passed Pawn
White to play and win
The Frontal Defense
Black to play and draw
Two Pawns Beat the Rook
White to play and win
Just Counting: The Promotion Race
White to play and win
Outflanking From Behind the Pawn
White to play and win
The Attacker's Shoulder-Charge
White to play and win
Cut Off One Rank Ahead of the Pawn
Black to play and draw
The Outside Passer: Play Where You Are a Piece Up
White to play and win
Lucena's Limit: The Rook Pawn
Black to play and draw
The Saavedra Study
White to play and win
PRO
Rook vs Connected Passed Pawns
White to play and win
PRO
Vancura With an Extra Rook Pawn
Black to play and draw
PRO
Smyslov's Method: The Rook Goes Back
White to play and draw
PRO
The g-File Defence: The King Tucks in on h3
White to play and draw
PRO
Connected Pawns Escorted by the Rook Alone
White to play and win
PRO
Kling and Horwitz: The King Blockades
White to play and draw
PRO
The King March and the Zugzwang Squares
White to play and win
PRO
The Rook at the Side of the Pawns
Black to play and win
PRO
The Exchange Threat and the Rook Sacrifice
Black to play and draw
PRO
Doubled Pawns and the Philidor Draw
White to play and draw
PRO
The Gap Between the f- and h-Pawns
White to play and draw
PRO
Defending Against Split Kingside Pawns
Black to play and draw
PRO
Giving Up the h-Pawn to Push the f-Pawn
White to play and draw
PRO
Lasker's Idea: Check, Then Capture
White to play and win
PRO
Active Defence: Walk the King to the Passer
Black to play and draw
PRO
Self-Propelled Pawns Against a Counter-Runner
White to play and draw
PRO
One Tempo for the a-Pawn
Black to play and draw
PRO
The Structure Decides, Not the Tempo
White to play and win
PRO
The Same Position, One Tempo Better
White to play and win
PRO
Winning the Rook for the Pawn
White to play and win
PRO
The f-Pawn Breaks the a8 Fortress
White to play and win
PRO
The Umbrella: Hiding Behind an Enemy Pawn
Black to play and win
PRO
Vertical Checks Against the Far-Advanced Pawn
Black to play and draw
PRO
The Rook in Front of Its Pawn
White to play and win
PRO
The Vancura Position
Black to play and draw
PRO
The Short-Side Defense
Black to play and draw
PRO
Checking Distance: The Long Side
Black to play and draw
PRO
The Kling and Horwitz Defense
Black to play and draw
PRO
Connected Passers vs the Counter-Pawn
White to play and win
PRO
Rook vs Three Connected Pawns
White to play and win
PRO
The Knight-Pawn Squeeze
White to play and win
PRO
The Pawn That Beats the Rook
White to play and win
PRO
The Rook's Waiting Move
White to play and win
PRO
The Tail-Hook
Black to play and draw
PRO
Hold the Rook Pawn with Precise Checks
Black to play and draw
PRO
The Second-Rank Defense against Doubled Pawns
White to play and draw
PRO
F- and H-Pawns Beat the Back-Rank King
White to play and win
PRO
The e6 Wedge: Two Pawns Beat One
White to play and win
Rook vs minor
Rook against bishop or knight, and the wrong corner.
Rook vs Bishop: The Safe Corner
Black to play and draw
Why the Bishop Pawn Only Draws
White to play and draw
Rook and Bishop: The Philidor Win
White to play and win
Finishing the Philidor Position
White to play and win
Defending Rook Against Rook and Bishop
Black to play and draw
The Second-Rank Defense
White to play and draw
Holding the Rook and Bishop Ending
White to play and draw
Rook Against Rook and Bishop: Holding the Draw
Black to play and draw
Driving the King to the Dangerous Corner
White to play and win
Step Out of the Safe Corner
Black to play and draw
Winning Despite the Safe Corner
White to play and win
Take the Outpost, Then Hunt the Bishop
White to play and win
Stalemate, Not a Fortress
White to play and draw
PRO
Rook vs Knight: Keep the Knight Beside Its King
White to play and draw
PRO
The Pawn on the Bishop's Colour Is Lost
White to play and win
PRO
The Knight Does Two Jobs on h3
White to play and draw
PRO
The Knight Belongs on h5
White to play and draw
PRO
Imprison the King, Then Zugzwang
Black to play and win
PRO
Maizelis: Cage the King in the Corner, Then Squeeze
Black to play and win
PRO
Play for Zugzwang, Not a Breakthrough
White to play and win
PRO
The Colour Barrier You Cannot Cross
Black to play and draw
PRO
Give the Bishop, Reach Rook Against Pawn
White to play and draw
PRO
Rook vs Knight: The Stranded Horse
White to play and win
PRO
Rook and Bishop vs Rook: The Second Rank
Black to play and draw
PRO
Rook vs Rook & Knight
White to play and draw
PRO
Rook Holds vs Bishop & Knight
White to play and draw
PRO
Rook & Pawn vs Knight
White to play and win
PRO
Rook & Pawn vs Bishop
White to play and win
PRO
Knight & Pawn Hold vs Rook
Black to play and draw
PRO
Bishop & Pawn Hold vs Rook
Black to play and draw
Queen endgames
Queen vs pawn, queen + pawn vs queen, perpetual defenses.
Queen vs Pawn on the Seventh
White to play and win
Drawing Queen vs Rook Pawn
Black to play and draw
Drawing Queen vs Bishop Pawn
Black to play and draw
Queen vs Rook Pawn: The Winning Zone
White to play and win
Queen vs Two Connected Pawns
White to play and win
Botvinnik's Method: Blocking the Check with the Queen
White to play and win
Queen and Pawn versus Queen: The Reference Win
White to play and win
One Square Decides: The Defending King's Only Move
Black to play and draw
Queen Against Bishop and Knight: The Rare Exception
White to play and draw
PRO
Bishop Pawn: Winning With the Defender by the Corner
Black to play and win
PRO
Bishop Pawn: The King on the Wrong Side
Black to play and win
PRO
The Corner Trick: Invite the Promotion
Black to play and draw
PRO
Queen and Pawn versus Queen: Getting the King in Front
Black to play and draw
PRO
Queen vs Queen: The Skewer Check
White to play and win
PRO
Queen and Pawn vs Queen
White to play and win
PRO
Queen and Pawn vs Queen: The Perpetual
Black to play and draw
PRO
Queen vs Two Bishops
White to play and win
PRO
Queen vs Two Knights
White to play and win
Queen vs rook
Grinding down the rook, and the fortresses that hold.
Rook versus Queen: Ponziani's Perpetual
Black to play and draw
Philidor's Position: Winning Queen versus Rook
White to play and win
Two Protected Squares, No Zugzwang
White to play and draw
The Rook Pawn on the Seventh: Only One Protected Square
White to play and win
The Rook Pawn on the Sixth: A Break-in That Wins Nothing
White to play and draw
A Central Pawn on the Sixth Is Lost
White to play and win
The Knight Pawn on the Sixth: The King Stays Behind It
White to play and draw
Why the Knight Pawn Holds and the Central Pawn Does Not
White to play and draw
Defending Rook and Knight Pawn: King in Front Is Allowed
Black to play and draw
PRO
The Extra Pawn That Loses the Draw
White to play and win
PRO
A Passed Pawn and Still No Zugzwang
White to play and draw
PRO
The King on the Seventh Changes the Verdict
White to play and win
PRO
Adjacent Pawns: Walk the King to g7
Black to play and draw
PRO
The Queen Sacrifice That Breaks the Wall
White to play and win
PRO
Queen vs Rook
White to play and win
PRO
The Fortress: Rook and Pawn vs Queen
White to play and draw
PRO
Queen vs Two Rooks
White to play and draw
PRO
Rook & Knight Hold vs Queen
Black to play and draw
PRO
Rook & Bishop Hold vs Queen
Black to play and draw