[Bug-XBoard] [bug #15652] Problem with FEN mate position

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?func=detailitem&item_id=15652>

                 Summary: Problem with FEN mate position
                 Project: XBoard
            Submitted by: None
            Submitted on: Tue 02/07/06 at 14:32
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open

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Details:

When I load the following FEN position file into Xboard and using Crafty, the
engine goes crazy:

8/8/4K3/8/8/8/8/kq6 b - - 0 1
8/8/8/8/8/7R/5K2/7k b - - 0 1

On loading the first position, everything is fine. Then I go to the next
position via the NextPosition Command in Xboard and then Crafty goes bezerk,
stalling the system due to heavy disk access, and its log file goes to 1
GByte containing this (repeatedly):

Black(1): new
White(1): random
White(1): level 40 5 0
40 moves/5 minutes primary time control
40 moves/5 minutes secondary time control
White(1): hard
pondering enabled.
White(1): ping 6
pong 6
White(1): force
White(1): setboard 8/8/8/8/8/7R/5K2/7k b - - 0 1

       +---+---+---+---+---+---+---+---+
    8  |   | . |   | . |   | . |   | . |
       +---+---+---+---+---+---+---+---+
    7  | . |   | . |   | . |   | . |   |
       +---+---+---+---+---+---+---+---+
    6  |   | . |   | . |   | . |   | . |
       +---+---+---+---+---+---+---+---+
    5  | . |   | . |   | . |   | . |   |
       +---+---+---+---+---+---+---+---+
    4  |   | . |   | . |   | . |   | . |
       +---+---+---+---+---+---+---+---+
    3  | . |   | . |   | . |   | . |-R-|
       +---+---+---+---+---+---+---+---+
    2  |   | . |   | . |   |-K-|   | . |
       +---+---+---+---+---+---+---+---+
    1  | . |   | . |   | . |   | . |<K>|
       +---+---+---+---+---+---+---+---+
         a   b   c   d   e   f   g   h

Black(1): undo

       +---+---+---+---+---+---+---+---+
    8  |   | . |   | . |   | . |   | . |
       +---+---+---+---+---+---+---+---+
    7  | . |   | . |   | . |   | . |   |
       +---+---+---+---+---+---+---+---+
    6  |   | . |   | . |   | . |   | . |
       +---+---+---+---+---+---+---+---+
    5  | . |   | . |   | . |   | . |   |
       +---+---+---+---+---+---+---+---+
    4  |   | . |   | . |   | . |   | . |
       +---+---+---+---+---+---+---+---+
    3  | . |   | . |   | . |   | . |-R-|
       +---+---+---+---+---+---+---+---+
    2  |   | . |   | . |   |-K-|   | . |
       +---+---+---+---+---+---+---+---+
    1  | . |   | . |   | . |   | . |<K>|
       +---+---+---+---+---+---+---+---+
         a   b   c   d   e   f   g   h

ERROR side not on move is in check!

       +---+---+---+---+---+---+---+---+
    8  |   | . |   | . |   | . |   | . |
       +---+---+---+---+---+---+---+---+
    7  | . |   | . |   | . |   | . |   |
       +---+---+---+---+---+---+---+---+
    6  |   | . |   | . |   | . |   | . |
       +---+---+---+---+---+---+---+---+
    5  | . |   | . |   | . |   | . |   |
       +---+---+---+---+---+---+---+---+
    4  |   | . |   | . |   | . |   | . |
       +---+---+---+---+---+---+---+---+
    3  | . |   | . |   | . |   | . |-R-|
       +---+---+---+---+---+---+---+---+
    2  |   | . |   | . |   |-K-|   | . |
       +---+---+---+---+---+---+---+---+
    1  | . |   | . |   | . |   | . |<K>|
       +---+---+---+---+---+---+---+---+
         a   b   c   d   e   f   g   h

ERROR side not on move is in check!


I have no idea what causes this fatal loop...






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