The "uniform random" policy in Table 2 plays all legal moves in classical chess with equal probability. Its entropy is more than double that of classical chess; conversely, like the hypothesis by Iida et al.,10 the classical opening book is a little smaller than the square root of the number of all legal openings.
Classical vs. no-castling chess. Both White and Black castle in most classical chess openings, and removing castling as an option profoundly changes the characteristics of the game.14 In this section, we explore the changes using one opening, the Berlin Defence, as an example. A tool is the decomposition of the entropy H(T)'s statistical expectation, which can help identify the existence (or not) of defensive lines that equalize the game in an almost forceful way. The top row in Figure 3 shows histograms of -log p(s) when s is generated from the AlphaZero prior after 1. e4 and 1. f3. The histograms provide a footprint of opening diversity.
encyclopedia of chess openings B pdf free 293
2ff7e9595c
Komentar