I used KO against this game with a 1 - 8 spread for 18 month's! Got fed up with playing a break even game. An AP on this site suggested ZEN with RA Indices. I took his recomendation to heart and with practice and patience have finally started putting some cash in my pocket. I think you will find Halves to be a good system, more difficult than ZEN, and a slightly lower win rate against your game of choice. HI OPT II, another excellent system, and without "A" side count will give you about the same results as ZEN. The ZEN system was easy for me because I was used to counting with the same tags, I only had to adjust to +2 for the 4,5,6 rather than + 1 ( KO ), and -2 for the 10 and Faces vs -1 ( KO ). I will always be grateful to the AP for his willingness to share and always look for his excellent, intellagant, and most helpful postings. I also thank all of the AP's for their contributions as well. If you wish to elaborate more, feel free to PM me.