Checkmate

[lrozenblyum]

Win Conditions. Checkmate

5.1. a) The game is won by the player who has checkmated his opponent’s king. This immediately ends the game, provided that the move producing the checkmate position was in accordance with Article 3 and Articles 4.2 – 4.7.

[lrozenblyum]

Citing 1.2 "The objective of each player is to place the opponent’s king ‘under attack’ in such a way that the opponent has no legal move. The player who achieves this goal is said to have ‘checkmated’ the opponent’s king and to have won the game"

[lrozenblyum]

Glossary
checkmate: 1.2. Where the king is attacked and cannot parry the threat. In notation ++ or #.

[lrozenblyum]

TODO:

• introduce terminal state - Position which has no allowed moves from
• inform Winboard about this state
• get information about checkmate from Winboard
• learn evaluators if needed

[lrozenblyum]

Informing Winboard about state should be done according to the rule:

RESULT {COMMENT}
When your engine detects that the game has ended by rule, your engine must output a line of the form "RESULT {comment}" (without the quotes), where RESULT is a PGN result code (1-0, 0-1, or 1/2-1/2), and comment is the reason. Here "by rule" means that the game is definitely over because of what happened on the board. In normal chess, this includes checkmate, stalemate, triple repetition, the 50 move rule, or insufficient material; it does not include loss on time or the like. Examples:
0-1 {Black mates}
1-0 {White mates}
1/2-1/2 {Draw by repetition}
1/2-1/2 {Stalemate}