rn3rk1/1b2b2p/p7/qp1p1pp1/1P1pp1P1/N3P2B/PBP4P/2R1Q1KR b - - 2 21
FEN state: rn3rk1/1b2b2p/p7/qp1p1pp1/1P1pp1P1/N3P2B/PBP4P/2R1Q1KR b - - 2 21 ; Best move: e7b4
The current state of the chess board is: Black rook at a8, black knight at b8, black rook at f8 and black king at g8. Black bishop at b7, black bishop at e7 and black pawn at h7. Black pawn at a6. Black queen at a5, black pawn at b5, black pawn at d5, black pawn at f5 and black pawn at g5. White pawn at b4, black pawn at d4, black pawn at e4 and white pawn at g4. White knight at a3, white pawn at e3 and white bishop at h3. White pawn at a2, white bishop at b2, white pawn at c2 and white pawn at h2. White rook at c1, white queen at e1, white king at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 2. Full move number is 21. Black to move.