En Passant Out of Check is Not Considered
Farewell to King evaluates a checkmate when the player may en pasant out of check. Observed with Fly by Knight 1.0.0 w/ Farewell to King 1.2.0 as well as 1.0.1-dev with Farewell to King optimization branch (commit db83a148).
Example FEN: 6kr/6b1/2p3p1/ppP4p/2KP2bP/1P4r1/P7/4R2R w - b6 0 25
FBK Log: false_checkmate.fbk
Edited by Ed Sandor