power and powerdifferenceThe power of a piece is its material value: 1 for a pawn; 3 for a bishop or knight; 5 for a rook; and 9 for a queen. Kings and empty squares are ignored, or nominally have zero power.
The power of a set of squares in a position is the sum of the power of all the pieces on squares in that set in the position.
powerpower filter is the word
powerfollowed by a range followed by a set filter:
power filter := 'power' range set-filterFor example,
power 15 1000 Ais a power filter with range
15 1000and set filter of
A power filter matches a position if the power of the pieces on the squares denoted by its set filter in that position lie within its range. Thus,
power 15 1000 A matches positions where the power (material value) of the White pieces is at least 15.
1.p Slovensky Narod
result 1-0 event "1.p" initial power 7 [Aa]
The diagram above shows the earliest first prize win study with an initial total power of 7.
powerdifferenceA powerdifference filter is the word
powerdifferencefollowed by a range and an argument list with two set filters:
powerdifference := 'powerdifference' range '(' setfilter1 setfilter2 ')'A powerdifference filter matches a position if the difference in the powers of its first and second arguments lies within the range. For example:
result 1-0 wtm not check power 1 A powerdifference -1000 -20 (A a)The above study by Dawson has a powerdifference of 35.
Note that the range can include negative values. Examples