"One of the main aspects of depth is difficulty and number of decisions that must be made, and this also contributes very substantially to how "heavy" a game feels.
Difficulty of decision has at least 3 major components:
(i) The number of distinct and non-trivial options that are immediately available. [1]
(ii) The depth or implication of each option. In some cases, this might be the depth of the search tree for each option. [2]
(iii) How critical the decision is. In chess, the loss of a single piece is crippling, whereas in a 200+ counter wargame the possible fate of each counter does not demand such close consideration. "
-Complexity:_Options_Versus_Real_Choices?
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