rnb1k2r/ppp3np/1P6/1R1p1pp1/2P2P1P/B2P4/P3P3/4KBNR b - - 2 20
FEN state: rnb1k2r/ppp3np/1P6/1R1p1pp1/2P2P1P/B2P4/P3P3/4KBNR b - - 2 20 ; Best move: a7b6
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8 and black rook at h8. Black pawn at a7, black pawn at b7, black pawn at c7, black knight at g7 and black pawn at h7. White pawn at b6. White rook at b5, black pawn at d5, black pawn at f5 and black pawn at g5. White pawn at c4, white pawn at f4 and white pawn at h4. White bishop at a3 and white pawn at d3. White pawn at a2 and white pawn at e2. White king at e1, white bishop at f1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 2. Full move number is 20. Black to move.