Pass

Nobody has claimed this yet.

**Very well done Alexander!**

_Scharre_; the game where `GREENWHITE` is a shade of yellow!

An idea:
_Your code_:
```rust
match _col % 2 {
0 => {
if _row % 2 == 0 {
if is_a_move {
GREENWHITE
} else {
WHITE
}
} else {
if is_a_move {
GREENBLACK
} else {
BLACK
}
}
}
_ => {
if _row % 2 == 0 {
if is_a_move {
GREENBLACK
} else {
BLACK
}
} else {
if is_a_move {
GREENWHITE
} else {
WHITE
}
}
}
}
```
_Shorter code_:
```rust
match (is_a_move, (_col + _row) % 2 == 0) {
(true, true) => GREENWHITE,
(true, false) => GREENBLACK,
(false, true) => WHITE,
(false, false) => BLACK
}
```

Search the Rust codebase for the shown match on _col, _row, and is_a_move. Compare the current behavior with the shorter match expression, then apply the equivalent simplification if appropriate. Done means the color-selection behavior remains unchanged while the duplicated branching is reduced.

Written by the indexing model from the issue text.