1n2k2r/rp2p1b1/p1q2pp1/2np3p/2BPP1P1/1P5b/P1PKQP1R/RN4N1 w k - 1 20
FEN state: 1n2k2r/rp2p1b1/p1q2pp1/2np3p/2BPP1P1/1P5b/P1PKQP1R/RN4N1 w k - 1 20 ; Best move: e4d5
The current state of the chess board is: Black knight at b8, black king at e8 and black rook at h8. Black rook at a7, black pawn at b7, black pawn at e7 and black bishop at g7. Black pawn at a6, black queen at c6, black pawn at f6 and black pawn at g6. Black knight at c5, black pawn at d5 and black pawn at h5. White bishop at c4, white pawn at d4, white pawn at e4 and white pawn at g4. White pawn at b3 and black bishop at h3. White pawn at a2, white pawn at c2, white king at d2, white queen at e2, white pawn at f2 and white rook at h2. White rook at a1, white knight at b1 and white knight at g1. Black kingside is the only castle move available. Half move number is 1. Full move number is 20. White to move.