Sunday 26 August 2018

7-man Mutual Zugzwangs (K + 3P vs K + 2P)

All 7-man Syzygy tablebases have been generated by Bojun Guo! It took 5 months on two high-end computers with more than 1TB memory each. Because of the dependencies, the K + 3P vs K + 2P tablebase was built last. I have checked this tablebase with SEE, and I have found 173990 mutual zugzwangs where the side with 3 pawns wins only if the other side is to move. Here you can download the list in a pgn file:

KPPPvKPP

Believe it or not, this is a mutual zugzwang. No, the h5 pawn is not misplaced!


mutual zugzwang

There are also 36955 mutual zugzwangs where the side with 2 pawns wins:

KPPvKPPP

The 6790 full point mutual zugzwangs are in both lists, so they are counted twice. Here is a separate list of them:

Full Point Mutual Zugzwangs

In total, there are 204155 unique mutual zugzwangs in the K + 3P vs K + 2P endgame.

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