Chess-EPDs

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Various EPD test suites, Public Domain, no Copyright should apply. Where known, EPD original source credited. Collected up from various Internet sources.

Added Odds-suites in three directories

1. Normal opening type positions
2. Random opening type positions
3. Master lists for nite-odds for gauntlet testing. These are the nites-odds suites that testers should use in order to remain consisent with each other.

There are suites for knight-odds, bishop-odds, rook-odds, queen-odds, pawn-f2-odds and a few others. Probably the knight odds are the most useful. The Normal opening types suites contain mostly chess-normal positions and are the better ones to use for testing purposes.

At time of writing, testes are seemingly showing that Stockfish 11 (latest version) is able to give knight odds against Grandmaster strength chess engines from several years ago and achieve a 50-50 result.

This batch all have bm = 'BestMove' indicated.

900 plus random positions benchmark.epd

famous test from 1980's bratko-kopec.epd

designed to break EPD handlers, some are valid chess positions, some not destruction-test.epd

fortress positions fortresses.epd

anything that caused issues at one time or another grief-causers.epd

famous test positions credited to Larry Kaufman kaufman.epd

famous LC2 test positions lct2.epd

various test positions, some duplicates mixed.epd

famous nolot test positions nolot.epd

from Rybka forum rybka-forum.epd

famous Dann Corbitt quiet positions silent-but-deadly.epd

PERFT tests, with nodecount at various minimax search depths.

Format is: FEN D5 nodecount, where D=depth and nodecount=number of minimax nodes at depth D Most (if not all) have been tested against several engines, each time with same nodecount result, so they should be reliable enough.

Perft stress testers, designed to catch special moves (en passent, castles, promotions, in check and so on) perft.epd

Side to move is in double check (thanks to Ferninand Mosca) perft-ferdy-double-checks.epd

6000 plus positions (thanks to Marcel van Kervinck for placing in PD) perft-marcel.epd

these last two have not been give a final checkover, but passed two engines worth of testing so far

5000 plus positions each with check involved (thanks to Ferninand Mosca) ferdy_perft_single_check_1.epd to ferdy_perft_single_check_19.epd

3000 plus positions with en passant check involved (thanks to Ferninand Mosca) ferdy_perft_enpassant_1.epd

180 positions with double check involved (thanks to Ferninand Mosca) ferdy_perft_double_checks.epd