Not a duplicate of, but inspired by: A position in which checkmate is forced (obligatory)

What are the legal positions that have the most possible forced checkmates for one side, and for both sides?


The answer to this has already been given as an answer in a related question. That answer was 55.

[Title "Ludwig Zagler, Feenschach 1972"]
[FEN "1rB1Q1Q1/1PRQ3Q/2b2k2/2pQ1N1Q/4KRPp/5N2/1R6/B3nn1b w - - 0 1"]

The position is taken from Tim Krabbe's website. According to Krabbe:

There are 12 mates by Rb2; 1 by g5; 1 by Qd5; 7 by d7; 7 by Qe8, 7 by Qg8; 6 by Qh5; 6 by Qh7; and 8 by Nf5, for a total of 55.

The record with both sides to move is 39 according to this Matplus.net thread.

[Title "Ludwig Zagler, Fairy Chess 6/1974"]
[FEN "6B1/2p2R1B/2P1k1NR/2P1q1PP/1pp1Q1p1/brn1K1p1/1b1r2P1/n1b5 w - - 0 1"]
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