You are on the backup site for Any posts, moves, or other changes you make here will not be permanent, because the pages and database from the main site will be backed up here every midnight EST. Additionally, things may not be working right, because this site is also a testbed for newer system software. So, if you are not here to test, develop, or merely read this site, you may want to change .org to .com in the navigation bar and go to the main site.

The Chess Variant Pages

[ Help | Earliest Comments | Latest Comments ]
[ List All Subjects of Discussion | Create New Subject of Discussion ]
[ List Earliest Comments Only For Pages | Games | Rated Pages | Rated Games | Subjects of Discussion ]

Single Comment

Chess. The rules of chess. (8x8, Cells: 64) (Recognized!)[All Comments] [Add Comment or Rating]
Kevin Pacey wrote on 2019-07-20 UTC

On computer chess (or even human) piece valuations, a 'controversial variation of the Nimzo-Indian Defence' (according to Dutch Grandmaster Jan Timman in The Art of Chess Analysis, circa 1980, referring to 5...Nf6-e4 below) that I (as a master-level player) have liked to play as Black over the years just might illustrate an exception to giving a very significant bishop-pair bonus on an 8x8 board to the side possessing it, even when there appears to be no clear reason to make the exception.

The variation in question goes 1.Pd2-d4 Ng6-f6 2.Pc2-c4 Pe7-e6 3.Nb1-c3 Bf8-b4 4.Pe2-e3 Pb7-b6 5.Ng1-e2 Nf6-e4 6.Qd1-c2 Bc8-b7 7.Pa2-a3 Bb4-c3(ch) 8.Ne2-c3 Ne4-c3 9.Qc2-c3 (see diagram below; note that nowadays in my games, some players prefer to give Black the bishop pair instead, by playing 6.Bc1-d2[!] - in either case there are some tiny factors going on in favour of either side, but these are not so easy to articulate, at least in a few words, even for master-level players; also note my 2008 book Encyclopedia of Chess Openings volume E, 4th edition gives the line as definitely slightly better for White ["+="] in either case, but my more modern chess database's human evaulation [i.e. that of 2015's Chess Assistant16] gives White only its usual symbolic edge ["+=/="] as in its more mainline openings' variations, also with the CA16 engine's evaluation as only 0.04 pawns in White's favour, in either case):