https://arxiv.org/abs/1806.02643 and https://arxiv.org/abs/1803.06376 (as does the choice to drop the checkpoints & historical self-plays in general from the training) indicate that AlphaGo versions, at least up until then, tend to be transitive:

> What is worthwhile to observe from the AlphaGo dataset, and illustrated as a series in Figures 3 and 4, is that there is clearly an incremental increase in the strength of the AlphaGo algorithm going from version αr to αrvp, building on previous strengths, without any intransitive behaviour occurring, when only considering a strategy space formed by the AlphaGo versions.