[Retros] Points

Eric Angelini Eric.Angelini at kntv.be
Thu Nov 24 00:48:35 EST 2016

Thanks François -- I will try to find
those 5 moves this w.-e. !
Catapulté de mon aPhone

Le 24 nov. 2016 à 04:46, Francois Labelle <flab at wismuth.com<mailto:flab at wismuth.com>> a écrit :

Hi all,

Maybe we can formalize Eric's idea as the "net change in material value", where a capture causes a negative change, and (I propose) a promotion causes a positive change. For example, a queen promotion would be worth +8 (+9 for the queen, and -1 for the disappearing pawn). The standard valuation is 1,3,3,5,9 for P,N,B,R,Q.

-- Black has just long-castled at the

5th move, leaving 24 points out of

the board; what points?

[in other words, what pieces were

captured during the game, representing

a total amount of 24 points as explained


According to my computer, the maximum net loss in material is indeed 24, but the captured pieces are not unique as the captured knight can be white or black:

1. e4 Nc6 2. Qg4 d5 3. Qxc8 Qxc8 4. Nh3 Qxh3 5. gxh3 O-O-O
1. e4 Na6 2. Qg4 d6 3. Qxc8 Qxc8 4. Bxa6 Qf5 5. exf5 O-O-O

Without the O-O-O constraint, the maximum is 30 and the solution turns out to be unique (I mean the game is unique, not just the identity of the captured pieces), so maybe this is a nicer problem:

"Find a game in 5.0 moves with a net loss in material of 30 points"


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