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"Ladder" is a UCI option to weaken the play of Cfish to human levels by reducing the number of  nodes (positions) Cfish sees while keeping the full strength evaluation and search functions.  At the lowest Ladder Level Rating of 1200, Cfish will play a move after searching ~ 64 nodes.  For every increase in a Ladder Level rating , it will slowly increase the nodes by about 0.7%, so that for every 100 rating point increase in the Ladder Level, it will see double the number of nodes.  At 1200, it will see ~ 64 nodes, at Ladder level 1300 it will see  about ~ 128 nodes, and so forth, so that at Ladder level 1600 it will see about 1024 nodes and at 2600 Ladder Level Rating it will see ~ 1 million nodes.   The highest is level is 2800 and it will see  ~ 4 million positions per move at a level control permitting sufficient time.  This would be about 2 seconds on my machine

"Ladder Range" will enable Cfish to play within a variable range selected at random from move to move.  A 100 to 250 Ladder Level point range is the recommended range.  but you may set that range as high you like based on your preference. Using the Ladder Range will increase variability in Cfish's play 

"Ladder Delay"  implements a non-busy sleep function that will for Cfish to use the optimum time for the  time control selected.  Ladder Level provides the user with about 1400 levels.  The idea is that the user get comfortable playing and winning at a certain level, the user can slowly increment the strength at a 10, 25 or 50 rating point increments - and climb the ladder