Used Name

Definition

Where and/or What

char bord [280]

Playing board where it all happens

char bord2 [256]

Square attacks (white)

char bord3 [256]

Square attacks (black)

char hang_tab [920000]

Precalculated table (attack.bin) read into memory for fast detection of hanging pieces (SEE).

Created in init() used in eval2.c

wpnum [16]

zpnum [16]

Row based pawn table (for white and black) indicating the rank of a pawn.

Created in init() used for mobility, king safety, pawn evaluation, detecting passed pawns.

wpdup [8]

zpdup [8]

Row based pawn table indicating the number of pawns.

Created in init() used for double isolated pawn evaluation.

xw | xz

Sum pieces following the 9|5|3|3|1 rule.

Created in init() among other things used for determining the game phase, enough material left for king safety.

xwp | xzp

Sum number of pawns.

Created in init() among other things used for the late endgame evaluation mainly.

xwz

Game phase:

4 = middle game

3 = middle game without queens

2 = late end game

1 = normal endgame

Created in init() and used for various evaluations.

veldwz | wpnt1 | wpnt2 | zpnt1 | zpnt2

Already introduced on the main page.

mg | eg

Piece Square evaluation middle game and end game.

attack.c

wmat

sum material of the pieces as defined in table hsw (see table.c)

attack.c

mpi

double pawn evaluation.

Done in init()

mp

Final evaluation score.

first_time

Variable used to initialize bord and read attack.bin into memory.

Done in init()

bgstel

start position in REBEL format.

tables.c

ks | kval1 | kval2 | wpaf | wpbg | zpaf | zpbg

king safety evaluation.

tables.c

mobtab

mobility evaluation

tables.c

wbit | zbit | remval | remcore

late endgame evaluation, more info.

tables.c

wpm | wpe | wpl (white)

zpm  | zpe  | zpl (black)

pawn piece square evaluation middle game, end game, when long castle

pst.c

wnm | wne (white)

znm  |  zne (black)

knight piece square evaluation middle game, end game.

pst.c

wlm | wle (white)

zlm  | zle  (black)

bishop piece square evaluation middle game, end game.

pst.c

wtm | wte (white)

ztm  | zte  (black)

rook piece square evaluation middle game, end game.

pst.c

wdm | wde (white)

zdm  | zde (black)

queen piece square evaluation middle game, end game.

pst.c

wkm | wko | wkzk (white)

zkm  | wko | wkzk (black)

king piece square evaluation middle game, middle without queens and end game.

pst.c

wiso | ziso

penalty for weak pawn

pst.c

wpol | zpol

penalty if weak pawn on open file

pst.c

wpform | zpform

bonus when pawn has a connection

pst.c

wpform6 | zpform6

extra bonus when pawns connect on equal rank.

pst.c

wblok | zblok

evaluate pressure on a weak pawn.

pst.c