Continuing our examination of orange X-up responses (which, again, I think aren’t all that good, but can still be very tricky for violet to win if orange is savvy)…. here’s a look at the main line for orange and violet.
The main problem with this particular opening is that it’s susceptible to “quasi-mirroring”: viz., orange keeps playing roughly “equivalent” moves (if violet plays a long hanging piece, then orange plays a long hanging piece; if violet plays a kiss move, then orange plays a kiss move), and even if they aren’t exact mirrors the results are usually nearly a tie. So violet must find a way to (1) create a decisive advantage and (2) do it before orange gets within striking distance of the vulnerable left bottom corner of violet’s N (if orange is permitted to cut that off, then orange obtains most or all of the left bottom corner, which probably means an orange win).
This game shows one way of trying to stop the circling & create a violet advantage by pushing orange away from the vulnarable N while maintaining violet attacks on both fronts. Mike Yosuke first showed me the violet L5 move here. Its power is that orange cannot BOTH block the right AND attack, since the only move that will cut off the violet L5 is orange I5 (and to do so would be to permit violet to attack on the left on the following turn).
That said, violet has a very precarious position on the bottom, as the nicer long pieces (Y, N, L5) are now all gone and violet has few felicitous ways to defend the bottom while maintaining control over the bottom left. As you can see from the following game, simply ceding the bottom left corner results in a tie:
1. F – X
2. X – W
3. N – Y
4. L5 – N
5. Y – L5
Violet Y may be turned with the knob on the left rather than the right. If this is done, then I think orange must play I4 or I5–the key is to NOT kiss, as it’s important not to give violet ANY easy way to grab the bottom left corner.
6. W – Z5
Orange Z5 here is the maximum headache I could think of for violet: it makes a credible threat (to block off the bottom left corner & get a paw on violet’s N) and cannot be blocked by any single move with the exception of violet I4. (Violet I5 would give orange a 1-T4-I3 series of holes: disastrous.) — All that said, it’s not entirely clear to me that violet need block it, rather than blocking off the top. But for the sake of this analysis let’s look at what happens if violet blocks….
7. I4 – F
NOT T5 or anything else that could be blocked with a piece that would also simultaneously dispose of the leak off orange X. Orange needs to keep this leak in play….
8. T5 – 1
9. Z5 – I2
10. I3 – V5
11. P, and the rest is packing.
The result: a 64-64 tie. Quite nice for orange. So, the question is: can violet do better by ignoring the orange Z5 & proceeding with the attack on top? Tune in to the next episode to find out….