2b1k2r/1r1nb1p1/pp1p3p/2pnp3/4P1P1/P2QP1NP/1PP1BP2/1RB1K1NR w K - 0 20
FEN state: 2b1k2r/1r1nb1p1/pp1p3p/2pnp3/4P1P1/P2QP1NP/1PP1BP2/1RB1K1NR w K - 0 20 ; Best move: e4d5
The current state of the chess board is: Black bishop at c8, black king at e8 and black rook at h8. Black rook at b7, black knight at d7, black bishop at e7 and black pawn at g7. Black pawn at a6, black pawn at b6, black pawn at d6 and black pawn at h6. Black pawn at c5, black knight at d5 and black pawn at e5. White pawn at e4 and white pawn at g4. White pawn at a3, white queen at d3, white pawn at e3, white knight at g3 and white pawn at h3. White pawn at b2, white pawn at c2, white bishop at e2 and white pawn at f2. White rook at b1, white bishop at c1, white king at e1, white knight at g1 and white rook at h1. White kingside is the only castle move available. Half move number is 0. Full move number is 20. White to move.