MESON Chess Problem Database

Problem Display
PID: 108433 (k2B4/rn6/8/8/8/5Q1K/8/1R6 w - - 0 1)

Holladay, Edgar Dinwiddie

Northwest Chess, 1974

k2B4/rn6/8/8/8/5Q1K/8/1R6

#2

4 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qxb7#
    • 1...Ra2
      • 2.Qxb7#
    • 1...Ra4
      • 2.Qxb7#
    • 1...Ra5
      • 2.Qxb7#
    • 1...Ra6
      • 2.Qxb7#
  • Tries
    • 1.Bc7?
      • 1...Ra1
        • 2.Rxa1#
        • 2.Qxb7#
      • 1...Ra2
        • 2.Qxb7#
      • 1...Ra4
        • 2.Qxb7#
      • 1...Ra5
        • 2.Qxb7#
      • 1...Ra6
        • 2.Qxb7#
      • 1...Ra3!
    • 1.Rb3?
      • 1...Ra1
        • 2.Qxb7#
      • 1...Ra2
        • 2.Qxb7#
      • 1...Ra3
        • 2.Qxb7#
      • 1...Ra4
        • 2.Qxb7#
      • 1...Ra5
        • 2.Qxb7#
      • 1...Ra6
        • 2.Qxb7#
      • 1...Kb8!
  • Keys
    • 1.Ba5!
      • 1...Kb8
        • 2.Qf8#
      • 1...Rxa5
        • 2.Qxb7#
      • 1...Ra6
        • 2.Qxb7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • R(a);N_GUARD::QAB1(B),XS(b)
  • Tries
    • Try
      • B(D);
      • Vars
        • R(a);N_GUARD::QAB1(B),XS(b)
      • Refutation
        • R(a);P_PINQ(B)
    • Try
      • R(A);
      • Vars
        • R(a);N_GUARD::QAB1(B),XS(b)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • B(D);
    • Vars
      • K(c);P-FLIGHT::QAR(B)
      • R(a);N_GUARD,XB(D)::QAB1(B),XS(b)
      • R(a);N_GUARD::QAB1(B),XS(b)
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