MESON Chess Problem Database

Problem Display
PID: 12174 (k1b5/ppK5/5Q2/8/8/8/8/1R6 w - - 0 1)

Benoit, Marc

The Problemist, 1975

k1b5/ppK5/5Q2/8/8/8/8/1R6

#2

3 + 4

2012 Miniature Chess Problems from Many Countries 1981
3248 Miniatures canadiennes 2000
145 StrateGems 2015
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Rxb7?
      • threat
        • 2.Rb8#
      • 1...a5
        • 2.Qa6#
      • 1...a6
        • 2.Qxa6#
      • 1...Bxb7!
    • 1.Qb6?
      • 1...axb6
        • 2.Ra1#
      • 1...Bh3
        • 2.Qxb7#
      • 1...Bg4
        • 2.Qxb7#
      • 1...Bf5
        • 2.Qxb7#
      • 1...Be6
        • 2.Qxb7#
      • 1...Bd7
        • 2.Qxb7#
      • 1...a5
        • 2.Qxa5#
      • 1...a6!
  • Keys
    • 1.Qa6!
      • 1...bxa6
        • 2.Rb8#
      • 1...Bh3
        • 2.Qxb7#
      • 1...Bg4
        • 2.Qxb7#
      • 1...Bf5
        • 2.Qxb7#
      • 1...Be6
        • 2.Qxb7#
      • 1...Bd7
        • 2.Qxb7#
      • 1...b5
        • 2.Qxc8#
      • 1...b6
        • 2.Qxc8#

This anticipates 229382(2005)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(A);XP(b)
      • Threat
        • R1(A)
      • Vars
        • P(a);OGATEB::QAR2(B)
        • P(a);OGATEB::QAR2(B),XP(a)
      • Refutation
        • B(d);XR(A)
    • Try
      • Q(B);
      • Vars
        • P(a);OGATEB,XQ(B)::R(A)
        • B(d);N_GUARD::QAB1(B),XP(b)
        • P(a);OGATEB::QAR(B),XP(a)
      • Refutation
        • P(a);
  • Actual
    • Q(B);P_PINP(a)
    • Vars
      • P(b);N_SPINP(a),OGATE,XQ(B)::R1(A)
      • B(d);N_GUARD::QAB1(B),XP(b)
      • P(b);OGATE::QAR2(B),XB(d)
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