You can ask the computer science experts or find a solution in the FAQ if you still don't understand how a chess engine works. Every legal move creates a new position, known as a child node, and each of those child nodes, in turn, grows into more branches with every legal move.ĭespite the popular belief that it is the depth of the engine analysis that decides its credibility, the truth is that the depth value is heavily dependent on and should only be viewed with regard to NPS. This process can be described as a decision tree with its root being the current position. Once you make a move, the engine starts calculating various continuations in search of the best move. castling rights, repetition of moves, move turn, etc. Thus, 45,000,000 NPS = 45,000 kN/s = 45 MN/s.Ī node, in turn, is a chess position with its evaluation and history, i.e. You may often see NPS calculated in kN/s (kilo nodes per second) or MN/s to denote the number by one thousand or one million respectively. It indicates the number of positions the engine considers in one second. Nodes per second (NPS) is the main measure of chess engines’ speed. In fact, it may sometimes be even more talkative than the depth. Nodes per second or NPS, as it is often referred to, can tell much about the credibility of engine analysis. And yet, many players may ignore an equally important value called NPS. The higher it is the better the analyses are supposed to be. For example, the depth value is the first number that catches the eye. And while most players use them on a daily basis, they may not fully understand the importance and correlation of the values they show during analysis. Chess engines are an irreplaceable part of professional training.
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