b3kb2/p1pp3r/n3r1pp/PN6/RP1pPBnP/5P2/2P3P1/3K1BNR w - - 4 21
FEN state: b3kb2/p1pp3r/n3r1pp/PN6/RP1pPBnP/5P2/2P3P1/3K1BNR w - - 4 21 ; Best move: b5d4
The current state of the chess board is: Black bishop at a8, black king at e8 and black bishop at f8. Black pawn at a7, black pawn at c7, black pawn at d7 and black rook at h7. Black knight at a6, black rook at e6, black pawn at g6 and black pawn at h6. White pawn at a5 and white knight at b5. White rook at a4, white pawn at b4, black pawn at d4, white pawn at e4, white bishop at f4, black knight at g4 and white pawn at h4. White pawn at f3. White pawn at c2 and white pawn at g2. White king at d1, white bishop at f1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 4. Full move number is 21. White to move.