4k2r/1qp1b2p/rp3p1n/nN2p1pP/p3P3/PP3NP1/b2P1PR1/R1BQ1K2 w - - 2 21
FEN state: 4k2r/1qp1b2p/rp3p1n/nN2p1pP/p3P3/PP3NP1/b2P1PR1/R1BQ1K2 w - - 2 21 ; Best move: a1a2
The current state of the chess board is: Black king at e8 and black rook at h8. Black queen at b7, black pawn at c7, black bishop at e7 and black pawn at h7. Black rook at a6, black pawn at b6, black pawn at f6 and black knight at h6. Black knight at a5, white knight at b5, black pawn at e5, black pawn at g5 and white pawn at h5. Black pawn at a4 and white pawn at e4. White pawn at a3, white pawn at b3, white knight at f3 and white pawn at g3. Black bishop at a2, white pawn at d2, white pawn at f2 and white rook at g2. White rook at a1, white bishop at c1, white queen at d1 and white king at f1. Both players have exhausted their castles. Half move number is 2. Full move number is 21. White to move.