r1bk2r1/p2p3p/2nbpp1n/PBpP2p1/1P2P3/6PP/4K3/RN3q1R w - - 4 21
FEN state: r1bk2r1/p2p3p/2nbpp1n/PBpP2p1/1P2P3/6PP/4K3/RN3q1R w - - 4 21 ; Best move: e2f1
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at d8 and black rook at g8. Black pawn at a7, black pawn at d7 and black pawn at h7. Black knight at c6, black bishop at d6, black pawn at e6, black pawn at f6 and black knight at h6. White pawn at a5, white bishop at b5, black pawn at c5, white pawn at d5 and black pawn at g5. White pawn at b4 and white pawn at e4. White pawn at g3 and white pawn at h3. White king at e2. White rook at a1, white knight at b1, black queen at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 4. Full move number is 21. White to move.