Questions tagged [ply]

Ply is half a move, e.g. 1.e4 is 1 ply. 1.e4 e5 is 2 ply. (http://en.wikipedia.org/wiki/Ply_(game_theory))

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5answers
1k views

Is there a word to count one moving by one player?

Is there a word to count one moving by one player? For example, the following series of moves: e4 e5 2. Nf3 Nc6 3. Bb5 a6 is counted as three moves. But if I want to denote "e4" as a unit ...
3
votes
2answers
371 views

Why continue to increase search depth after mate is found?

Playing with test sets, several times I come across a behavior of the chess engines which I can't understand: Let's say I have the endgame [FEN "8/k7/3p4/p2P1p2/P2P1P2/8/8/K7 w - - 0 1"] which after ...
3
votes
2answers
984 views

What is the Elo rating of a chess computer that can only look 1, 2, 3, … moves ahead

Has anyone calculated the average Elo rating of a chess computer as a function of the number of half moves or plys ahead it can look. I realise that the Elo is also a function of the choice of move ...
12
votes
5answers
9k views

Does depth (number of ply) still matter once it is high enough?

This isn't real, just imagine this happening. Computer A is supercomputer. It can calculate 30 ply deep within 20 seconds. Computer B is supercomputer. It can calculate 15 ply deep within 20 seconds....