already fixed in revision 689 (from yesterday, see the
_[BUG] (bRC4) LF vs LF combat number of dice thread)
// fixed a condition problem in GP.CombatDiceNoCompute() causing LH to fight with 2 dice base number against other not fragmented skirmishers or against fragmented non-skirmishers in impact combat
The EBG LF Archers do not have any negative POA, as it can be seen in the detailed combat panel. The +1/-1 POA you see in the bottom combat panel is actually impact combat's POA score result (which is +1 for the charging BG, and therefore -1 for the charged EBG). Accordingly to the manual (Combat Mechanism section) the POA score is computed by adding the attacker's POAs and subtracting defender's POAs (in our care +1 - 0 = +1). If the POA result is greater than 2/lesser than -2, then is normalized (ie is made 2/-2). The attacker's POA = POA score while the defender's POA = - POA score (so if the POA score is negative, the attacker's POA will be negative, while the defender's POA will be positive).