[ Project Revision History ]
To castle, first click on your king, then 2 squares to the left or right, depending on whether you want to castle king-side or queen-side. The computer will move the rook around the king for you.
To capture en passant, just move your pawn diagonally forward one square as appropriate. The captured pawn will be removed for you.
To promote a pawn, just move the pawn as usual. The computer will ask you which piece you would like to promote to (queen, rook, bishop, or knight).
Click HERE, then look for the link on that page that says "Download J2SE JRE".
You DO NOT need to download the Software Development Kit (SDK)... it's way too big and has stuff that only programmers need!
PATH: 3 [ 0.4201 : 13. ... Qc7 14. f4 Ke7 15. Qe2 ] PATH: 3 [ 0.4701 : 13. ... Rh7 14. h3 Rg7 15. Bh6 ] PATH: 3 [ 0.4901 : 13. ... Bc6 14. Qf3 Qc7 15. Bf4 ] PATH: 3 [ 0.5792 : 13. ... c4 14. Qf3 cxb3 15. Bxf6 ] PATH: 4 [ 0.5194 : 13. ... c4 14. Qf3 Qc7 15. Bf4 Qd8 ] PATH: 4 [ 0.5782 : 13. ... Rg8 14. Qc1 c4 15. Qf4 cxb3 16. Bxf6 ] PATH: 4 [ 0.5894 : 13. ... d6 14. Qf3 Nbd7 15. Rfe1 d5 ] ChessThinker.think: think time = 5.058 seconds
Each line beginning with "PATH:" is an expression of what the computer is thinking about the current position. The number to the left of the "[" is how many turns (called plies) into the future the computer was thinking. Note that the computer will go past this search limit to expand out a series of captures. This is called quiescence search.
Inside square brackets is a numeric score that indicates how good or bad the computer thinks the position is. Positive numbers mean that the computer thinks it has an advantage, and negative numbers mean the computer thinks its opponent has an advantage. For example, a score of 1.0000 means the computer thinks it is winning by the equivalent of one pawn. Positional factors are involved in calculating this score, like king safety and pawn structure.
After the score is the predicted line of play, starting with the move that the computer thinks (so far) is its best. After that is the move it expects you will play in reply, and after that its reply back to that move, etc.