Contents page | Winboard setup | Command line parameters | Commands reference | Licence and Warranty
| analhash | - Analyse hash table contents. |
|---|---|
| endtest | - Run test for whether game is finished. |
| hamm | - Check hamming distance/Generate hash key data. |
| kpk | - Probe KPK endgame table (for current position). |
| kpktest | - Test KPK endgame table against Edwards tablebase. |
| perf | - Psuedo move generation/move performance test. |
| perfc | - Capture move generation/move performance test. |
| perft | - Psuedo move generation tree test. |
| score | - Show evaluation of current position. |
| tbanal | - Analyse Edwards tablebase file. |
| tbprobe | - Probe Edwards TB/Set Edwards TB directory. |
| testeval | - Test evaluation for black/white consistency. |
The analhash command scans the contents of the hash table and produces a report about its findings. It also reports some extra hash table counters that are not shown at the end of thinking.
analh[ash]
The endtest command simply tests whether the current position is an end of game position. I.E. it tests for checkmate, stalemate, draw-by-repetition, draw-by-50-move-rule and draw-by-insufficient-material.
endt[est]
The hamm command is used to generate and test the hash key data. It attempts to generate the hash keys with the minimum hamming distance that is specified. It is probably best to even exit the engine after running this command as it modifies the Zobrist hash key table, but doesn't make sure that anything else (e.g. the transposition table) has been updated to be in sync.
hamm [max-hamm-dist]
The kpk command causes the current position to be looked up in the internal KPK endgame table. If the current position isn't a KPK endgame then an error message is displayed instead. The KPK endgame table stores the distance (number of moves) to a successful promotion of the pawn (to a queen).
kpk
The kpktest command verifies the internal KPK endgame table against the corresponding Edwards table base files.
kpktest edwards-dir
The perf command performs the ssuedo move generation/move performance test. This test is done in two stages. In the first stage, the moves for the current position are repeatedly generated and thrown away. In the second stage, the moves are generated, and then each move is made and unmade on the board. At the end of each stage a report is made.
perf
perfc
The perft command generates and makes moves in a hierarchical tree structure rooted at the current position. It counts the number of "nodes" in the tree, and reports the amount of time it took to search to each depth in the tree.
perft [depth]
The score command shows a the static evaluation of current position, including lots of debug info showing how the the total score was arrived at.
sc[ore]
tba[nal] KxKy w|b [major-sq [minor-sq]]
The tbprobe command attempts to look up the current position in an Edwards tablebase file. If you supply a parameter, this sets the directory where the tablebase files reside.
tbp[robe] [edwards-dir]
The testeval command generates 10000 pseudo-legal random chess positions and their logical reflections (change side to move, flip board vertically, change colours of pieces), and makes sure that both evaluations of the same position match. This is great for catching black/white consistency mistakes in the coding of the static evaluation function.
teste[val]
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Page last updated by Tim Foden on the 17th March 2003.