Pawnless ending

A pawnless ending is an endgame position with no pawns and only the kings and a few pieces remaining. It includes basic checkmates, where an attacked king has no legal reply, as well as difficult endings such as rook and bishop versus rook or queen versus bishop and knight.

What changes when there are no pawns

• No pawn can promote, so the result depends entirely on whether the remaining pieces can coordinate and force checkmate.
• A fortress is a defensive formation that the stronger side cannot break despite having more material.
• Perpetual check is a sequence of checks that can be repeated without letting the king escape; it normally leads to a draw by repetition.
• Stalemate occurs when the player to move is not in check but has no legal move; it also ends the game as a draw.

Tablebases are databases that exhaustively calculate positions with few pieces and give the exact result under perfect play. That theoretical result must be separated from the result under tournament rules. Under FIDE rules, a player may claim a draw after 50 moves by each player without a pawn move or capture, and the game is automatically drawn after 75 such moves unless the final move is checkmate.

In a pawnless ending, no pawn move can reset that count. Only a capture can do so. A tablebase win may therefore be impossible to complete within the rule if it requires too many moves before a capture or checkmate.