Changes

Some programs have explicit evaluation terms concerning space. For instance, [[Stockfish|Stockfish]] defines a space area bonus by the number of safe squares for minor pieces on the central four files on ranks 2 to 4, counting twice if on a [[Pawn Spans|rearspan]] of an own pawn. The space area bonus is multiplied by a weight, determined by the number of own pieces minus number of open files <ref>[https://hxim.github.io/Stockfish-Evaluation-Guide/ Stockfish Evaluation Guide] Space area, Space</ref>. [[Toga|Toga II]] 3.0 gives a non-linear bonus for pieces on the opponent half of the board - the more the better <ref>[http://www.talkchess.com/forum/viewtopic.php?t=61064&start=4 Re: Calculating space] by [[Pawel Koziol]], [[CCC]], August 08, 2016</ref>. [[Senpai|Senpai 2.0]] considers space by the "glorified" [[Pawn chainChain|pawn chain]] [[Piece-Square Tables|piece-square tables]] <ref>[http://www.chessprogramming.net/senpai/ Senpai – Chess Programming]</ref>.