100 move rule

  • #1

    I recall several years ago that in B+R+K vs. R+K endings the 50 move rule was extended to 100 moves for this specific ending. Can this rule change be found anywhere here? This was a result of a computer showing a forced mate in about 60 moves. Thanks

  • #2

    I believe it was once extended to the 75 move rule, but it has since been changed back.

  • #3
    mdinnerspace wrote:

    I recall several years ago that in B+R+K vs. R+K endings the 50 move rule was extended to 100 moves for this specific ending. Can this rule change be found anywhere here? Thanks


    I'm pretty sure all those old ending "allowances" got changed again, to a standard 50 moves.

  • #4

    In fact it is a forced mate; why would the previous rule changed be abandoned? Does not compute! Excellent links from Prawn and chessisgood. Thanks guys!

  • #5
    mdinnerspace wrote:

    In fact it is a forced mate; why would the previous rule changed be abandoned? Does not compute!


    I think modern engines found quicker finishes and the extra moves were deemed superfluous.

  • #6
  • #7
  • #8

    There is even a "forced mate" in 223, according to tablebases (R+B vs 2N). The limit was at some time at 75 moves, then back to 50 again.

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