After x!h -> x!h, there are for hands types possible: 1. D(x), 2. 10(x), 3. (x), 4. D10(x) In 1, playing 9!h loses. In 2, playing 9!h gains. In 3, it makes no difference. In 4, it makes no difference. D10x - no difference D10xx - no difference D10xxx - no difference Yes, this is 50/50. Play whatever. Or read from the face of opponent. :)