rnb2r2/pp1ppkbp/3P3n/1qp2pp1/5NP1/NPP1P3/P2K1PBP/3R2R1 w - - 1 21
FEN state: rnb2r2/pp1ppkbp/3P3n/1qp2pp1/5NP1/NPP1P3/P2K1PBP/3R2R1 w - - 1 21 ; Best move: a3b5
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8 and black rook at f8. Black pawn at a7, black pawn at b7, black pawn at d7, black pawn at e7, black king at f7, black bishop at g7 and black pawn at h7. White pawn at d6 and black knight at h6. Black queen at b5, black pawn at c5, black pawn at f5 and black pawn at g5. White knight at f4 and white pawn at g4. White knight at a3, white pawn at b3, white pawn at c3 and white pawn at e3. White pawn at a2, white king at d2, white pawn at f2, white bishop at g2 and white pawn at h2. White rook at d1 and white rook at g1. Both players have exhausted their castles. Half move number is 1. Full move number is 21. White to move.