[FEN "r2qk2r/pb3p2/1p5p/4P1p1/2p5/P1Q1p1P1/1P3PP1/R3KB1R w KQkq"]

19. fxe3 b5


w b wb bw | w b wb bw

w     an



19. fxe3      an



19...b5      an