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How does S (Split) fare?

Posted By: Taper_Mike
Date: Saturday, 16 March 2013, at 10:34 a.m.

In Response To: 64P-33B-41 — 53P-33B-41 — 61P-33B-41 — 3-ply XG2 Rollouts (Timothy Chow)

Timothy: How bad is Z in each case?

In a word, lousy!

The table below compares S = 24/23 13/9 (which can also be called Z) against both W = 24/20 6/5 and U = 24/23 24/20. It includes the two illegal positions Chase posted in his excellent analysis.

Move Sequence XGR++ Nacbracs W – U W – S U – S
22D-33B-41 [$ W25 P51 S59 U63] "&e 38 34 –6
61P-33B-41 [W U48 $84 D87 e110 S120] "&e 48 120 72
53P-33B-41 [W U18 D55 S59 $81] "&e 18 55 41
64P-33B-41 [W U2 D40 S46 $78] "&e 2 46 44
75P-33B-41 [U D17 W21 S54 e87 $131] "&e –21 33 54

Chase’s 75P-33B-41 fits perfectly in the group. Chase’s other position, 22D-33P-41, creates a safe landing spot for the 4, so it is harder to make a direct comparison with the other positions.

The only time S fares at all well is when the 9pt has already been made (as in Chase’s second position). Both $ = 13/9 6/5 and S gain dramatically against W and U in 22D-33B-41. While S jumps ahead of U, however, its gains against W are not large enough to pass it.

This makes me want to offer a caveat to the commentary I wrote alongside the rollouts. Splitting with the 4 is strong in these positions, because once you decide to leave a shot when you play the 4, starting an advanced anchor is far better than dumping a target in the outfield. As was noted in my earlier post, Blue needs an advanced anchor. A builder on the 9pt, he can live without.

Mike

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