Good idea ! Thanks you, I understand the system now :) For people that still doesn't understand: just count +1 when winning and -1 when losing. And do a basic addition following the order. For example "LWWWLLW" your score s does:
s=-1 (L), s=s+1=(-1)+1=0 (W), s=s+1=0+1=1 (W), s=s+1=1+1=2 (W), s=s-1=2-1=1 (L), s=s-1=1-1=0 (L) s=s+1=0+1=1 (W).
Hope it can help understand GameA explanations :)