Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

WeakUnopposed penalty for backwards on file A or H #3275

Closed
wants to merge 3 commits into from
Closed

WeakUnopposed penalty for backwards on file A or H #3275

Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
b861428
Update pawns.cpp
FauziAkram Dec 25, 2020
713f006
Update AUTHORS
FauziAkram Dec 25, 2020
0e2845d
Bench: 4157164
FauziAkram Dec 25, 2020
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
16 changes: 8 additions & 8 deletions src/pawns.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -30,11 +30,11 @@ namespace {
#define S(mg, eg) make_score(mg, eg)

// Pawn penalties
constexpr Score Backward = S( 8, 25);
constexpr Score Doubled = S(10, 55);
constexpr Score Isolated = S( 3, 15);
constexpr Score WeakLever = S( 3, 55);
constexpr Score WeakUnopposed = S(13, 25);
constexpr Score Backward = S( 6, 23);
constexpr Score Doubled = S(13, 53);
constexpr Score Isolated = S( 2, 15);
constexpr Score WeakLever = S( 5, 57);
constexpr Score WeakUnopposed = S(16, 22);

// Bonus for blocked pawns at 5th or 6th rank
constexpr Score BlockedPawn[2] = { S(-15, -3), S(-6, 3) };
Expand Down Expand Up @@ -69,8 +69,8 @@ namespace {

// KingOnFile[semi-open Us][semi-open Them] contains bonuses/penalties
// for king when the king is on a semi-open or open file.
constexpr Score KingOnFile[2][2] = {{ S(-19,12), S(-6, 7) },
{ S( 0, 2), S( 6,-5) }};
constexpr Score KingOnFile[2][2] = {{ S(-21,10), S(-7, 1) },
{ S( 0,-3), S( 9,-4) }};

#undef S
#undef V
Expand Down Expand Up @@ -172,7 +172,7 @@ namespace {

else if (backward)
score -= Backward
+ WeakUnopposed * !opposed;
+ WeakUnopposed * !opposed * bool(~(FileABB | FileHBB) & s);

if (!support)
score -= Doubled * doubled
Expand Down