What are Syzygy tablebases?

About. Syzygy tablebases allow perfect play with up to 7 pieces, both with and without the fifty-move drawing rule, i.e., they allow winning all won positions and bringing all drawn positions over the fifty-move line.

How many Tablebase positions are there?

By August 2012, tablebases had solved chess for every position with up to seven pieces (the positions with a lone king versus a king and five pieces were omitted because they were considered to be “rather obvious”). As of 2022, work is still underway to solve all eight-piece positions.

What is chess Tablebase?

Tablebases are a database of precalculated endgame positions. With it, you can quickly find out if any position containing seven pieces or less is theoretically winning, losing, or drawn with perfect play from both sides.

What is a table based draw?

Tablebases are essentially databases of endgame positions that have been exhaustively analysed so that their outcomes (win/loss/draw) with best play by both sides are known with certainty.

What is Syzygy 50 move rule?

Syzygy tablebases are constructed around depth to conversion (DTC) and depth to resetting (zeroing) the 50 move rule. DTC means the shortest path to capture or promotion that leads to a simpler won position. For example: The DTM of this position is 2.

Is chess solved for 7 pieces?

Chess is solved for all positions with 6 pieces (including kings) or less on the board (except for 5 vs 1, which is easy to calculate anyhow). The solution for 7 pieces is estimated to be finished around 2015.

How do you use Syzygy tablebases?

How to use tablebases on Lichess? In endgame positions the opening explorer is replaced by a tablebase explorer. During analysis, click the book icon on the right side of the board to open it. It will show objective evaluations for every move in the position, giving you the best lines.

Is tic-tac-toe a solved game?

Tic-Tac-Toe is a solved game; unless a player makes a dumb mistake, every game will end in a draw. The board game Connect Four has been solved: The first player will always win if they make the perfect moves, regardless of what the other player does.