Author: Tord Romstad
Date: 15:05:24 03/07/06
Go up one level in this thread
On March 07, 2006 at 16:01:57, Dann Corbit wrote: >Fruit uses late move reductions, and yet the search is perfectly symmetrical. No, it is not. See the following output from Fruit 2.1: First I ask the program (freshly started, with default settings) to analyse the initial position to depth 5: position startpos go depth 5 info depth 1 info depth 1 seldepth 1 score cp 26 time 0 nodes 2 pv b1a3 info depth 1 seldepth 1 score cp 54 time 0 nodes 3 pv b1c3 info depth 1 seldepth 1 time 1 nodes 21 nps 0 info depth 2 info depth 2 seldepth 2 score cp 0 time 1 nodes 44 pv b1c3 b8c6 info depth 2 seldepth 2 time 1 nodes 82 nps 0 info depth 3 info depth 3 seldepth 3 score cp 54 time 1 nodes 148 pv b1c3 b8c6 g1f3 info depth 3 seldepth 3 time 1 nodes 186 nps 0 info depth 4 info depth 4 seldepth 6 score cp 0 time 1 nodes 300 pv b1c3 b8c6 g1f3 g8f6 info depth 4 seldepth 6 time 2 nodes 976 nps 0 info depth 5 info depth 5 seldepth 9 score cp 48 time 4 nodes 1729 pv b1c3 b8c6 g1f3 g8f6 d2d4 After a restart of the program, I try the same position with black to move: position fen rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR b KQkq - 0 1 go depth 5 info depth 1 info depth 1 seldepth 1 score cp 4 time 0 nodes 2 pv a7a5 info depth 1 seldepth 1 score cp 10 time 0 nodes 4 pv b7b5 info depth 1 seldepth 1 score cp 52 time 1 nodes 8 pv d7d5 info depth 1 seldepth 1 score cp 54 time 1 nodes 19 pv b8c6 info depth 1 seldepth 1 time 1 nodes 21 nps 0 info depth 2 info depth 2 seldepth 2 score cp 0 time 1 nodes 44 pv b8c6 b1c3 info depth 2 seldepth 2 time 1 nodes 82 nps 0 info depth 3 info depth 3 seldepth 3 score cp 54 time 1 nodes 148 pv b8c6 b1c3 g8f6 info depth 3 seldepth 3 time 1 nodes 186 nps 0 info depth 4 info depth 4 seldepth 6 score cp 0 time 1 nodes 300 pv b8c6 b1c3 g8f6 g1f3 info depth 4 seldepth 6 time 3 nodes 979 nps 0 info depth 5 info depth 5 seldepth 10 score cp 48 time 4 nodes 1743 pv b8c6 b1c3 g8f6 g1f3 d7d5 As you can see, the search isn't entirely symmetrical. The node counters and the selective search depths differ. If you repeat the experiment with Fruit 2.2, you will see the same thing. Tord
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