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it will play quicker later on. There is a time control after 40 moves
and after each succeeding 20 moves. Thus on level B4 the
computer will make 40 moves in 2 hours, and then 20 moves per 1
hour the rest of the game.
Level C1-D8 will play the whole game within the specified fixed
time, regardless of the number of moves which will be made. This
type of setting is mainly used for the very populary blitz and speed
chess games.
Level E1-E8 are training levels. On these levels the search depth
is limited to the number of half moves corresponding to the level
set. E.g. on level E1 the computer will only look one half move
ahead, and thus often overlook e.g. mate in one from the
opponent. This gives weaker play, and thus gives average players
a better chance of winning against the computer, together with the
ability of slowly increasing the playing strenth of the computer as
they get better. The very fast normal levels (A1 and C1) do not
necessarily give weak play if you yourself play slowly, as the
computer on these levels is also thinking in your time of reflection.
Thus level E1 is the weakest level of the computer.
Level F1 is used for demonstration. On this level the computer will
play at the same speed as you do, regardless of whether you play
quickly or slowly. This level is also used when you want a nice and
quiet home-chess game without thinking at time controls.
Level F2 works as level F1, except that the computer will play
double as fast as you (in case you are a little impatient).
Level F3 is the infinite level On this level the computer will think
infinitely, unless the position is found in its opening library, it has
only one legal move, it finds a mate or you terminate the search.
This can e.g. be used for postal chess where you let the computer
think a couplo of days at each move.
Level F4 is a special level used for solving mate problems. The
computer will first try to find a mate in 1, then a mate in 2, 3, 4, 5
etc.
