From the Readme:
Version History:
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Clueless_v1.4   Date 21.03.2007

- fixed Bug in time managment
- added a first shot of LMR

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Clueless_v1.3.6   Date 02.03.2007

- fixed glitch in time managment
- tuned material values and passer evaluation

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Clueless_v1.3.5   Date 31.01.2007

- fixed Bug which was introduced with last version update
  when probing hash tables at root node, sometimes pv-line is deleted resulting
  in the move a8a8
- added recapture extension

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Clueless_v1.3.4   Date 28.12.2006

- added passed pawn extensions
- extension limitations
- added AEL Pruning basics
 

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Clueless_v1.3.3   Date 16.12.2006

- bug fix (move list overflow, causing clueless to hang up)
 

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Clueless_v1.3.2   Date 14.12.2006

- fixed Bug in evaluation (rare division by zero) which caused Clueless to hang up
 

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Clueless_v1.3b   Date 05.12.2006

- improved time management, clueless tries to finish search if at current depth
  only few moves left or score has declined significantly
- modified scoring scheme for history heuristic => slight improvement in 
  move ordering 
- found and fixed HASH table bug, in some cases exact value was returned,
  although table entry was upper or lower bound only


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Clueless_v1.2.2   Date 02.06.2006

- fixed bug in pawn structure evaluation
- modified hash scheme
- fixed bug in move ordering scheme


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Clueless_v1.2.1b   Date 26.05.2006

- fixed bug in 50/rep Draw rules could have caused crash in rare cases
- fixed hash bug, hash was deleted and resized to default after each move
- mimor changes in pawn structure eavluation


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Clueless_v1.2b   Date 15.05.2006

- fixed bug in Null Move implementation
- modified history scoring
- modifications to evaluation function (still in Progress)


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Clueless_v1.1   Date 09.02.2006

- implemented Null Move
- replaced Killer Heuristic by History Heuristic
- minor modifications to move ordering


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Clueless_v_01_00_04   Date 23.12.2005

- modified time managment again, soon I will completely rework the interface thread


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Clueless_v_01_00_03   Date 16.12.2005

- modified time managment 

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Clueless_v_01_00_02   Date 10.12.2005

- fixed Problem with pondering
- fixed bug in thread syncronisation
- reworked time managment

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Clueless_v_01_00_01

- faulty implementation of pondering (work-a-round, disabled pondering for the moment)


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Clueless_v_01_00_00 first release