Hi Mark 1,

I think is a pure coincidence : as you said, not the same developers (Kittinger create Mychess/Savant alone), but also not the same processor (6502 versus Z-80).
And the Savant promote automatically a pawn to a queen or knight, but not in rook or bishop.The Mark III can promote a pawn to all pieces.

Perhaps the explosion of number of moves with 2 queens and too many stalemate possibilities (and small memory) make that the research prefer a simple knight (4 more moves, others are out of chessboard) ?

Cordialy,

mychess.