void take_step_and_capture(const Step& step, GameState *gs)
{
assert(step.is_motion());
gs->move_piece(step);
Step capture_step;
if (possible_capture_from_motion(*gs, step)) {
capture_from_motion(step, gs);
}
}
bool GameState::move_piece(const Step &s)
{
assert(s.is_motion());
const uint8_t c = s.get_color(), p = s.get_piece(), pos = s.get_position(), finish = s.get_finish();
return move_piece(c, p, pos, finish);
}