Configure logback/log4j to log "org.drools.planner" INFO for this: INFO Solving with random seed (0). INFO Starting with time spend (0), score (-6), new best score (-6). INFO Step index (0), time spend (4), score (-3), new best score (-3), accepted move size (12) for picked step ([Queen-1] 1 @ 0 => 3). INFO Step index (1), time spend (7), score (-1), new best score (-1), accepted move size (12) for picked step ([Queen-0] 0 @ 0 => 1). INFO Step index (2), time spend (10), score (0), new best score (0), accepted move size (12) for picked step ([Queen-3] 3 @ 0 => 2). INFO Solved at step index (2) with time spend (10) for best score (0) with average calculate count per second (7300). and DEBUG for this: INFO Solving with random seed (0). INFO Starting with time spend (0), score (-6), new best score (-6). DEBUG Ignoring not doable move ([Queen-0] 0 @ 0 => 0). DEBUG Move score (-4), accept chance (1.0) for move ([Queen-0] 0 @ 0 => 1). DEBUG Move score (-4), accept chance (1.0) for move ([Queen-0] 0 @ 0 => 2). DEBUG Move score (-4), accept chance (1.0) for move ([Queen-0] 0 @ 0 => 3). ... DEBUG Move score (-3), accept chance (1.0) for move ([Queen-1] 1 @ 0 => 3). ... DEBUG Move score (-3), accept chance (1.0) for move ([Queen-2] 2 @ 0 => 3). ... DEBUG Move score (-4), accept chance (1.0) for move ([Queen-3] 3 @ 0 => 3). INFO Step index (0), time spend (6), score (-3), new best score (-3), accepted move size (12) for picked step ([Queen-1] 1 @ 0 => 3). ... Op 22-05-11 17:37, felipebr schreef: -- With kind regards, Geoffrey De Smet