7r/r1pnk1bp/pp1p1p2/2q1p1p1/P1P1P3/1P1P1P2/NB1KB1nP/RQ4NR w - - 4 21
FEN state: 7r/r1pnk1bp/pp1p1p2/2q1p1p1/P1P1P3/1P1P1P2/NB1KB1nP/RQ4NR w - - 4 21 ; Best move: b1f1
The current state of the chess board is: Black rook at h8. Black rook at a7, black pawn at c7, black knight at d7, black king at e7, black bishop at g7 and black pawn at h7. Black pawn at a6, black pawn at b6, black pawn at d6 and black pawn at f6. Black queen at c5, black pawn at e5 and black pawn at g5. White pawn at a4, white pawn at c4 and white pawn at e4. White pawn at b3, white pawn at d3 and white pawn at f3. White knight at a2, white bishop at b2, white king at d2, white bishop at e2, black knight at g2 and white pawn at h2. White rook at a1, white queen at b1, 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.