MESON Chess Problem Database

Problem Display
PID: 177532 (1q6/Q1B2R2/1Pk5/8/2K5/8/8/8 w - - 0 1)

Jonsson, Christer

Postsjakk, 1975

1q6/Q1B2R2/1Pk5/8/2K5/8/8/8

#2

5 + 2

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc7
      • 2.Qxc7#
    • 1...Qxb6
      • 2.Qxb6#
    • 1...Qb7
      • 2.Qa4#
    • 1...Qa8
      • 2.Qxa8#
  • Tries
    • 1.Qa8+?
      • 1...Qb7
        • 2.Qa4#
        • 2.Qe8#
      • 1...Qxa8!
  • Keys
    • 1.Qa6!
      • threat
        • 2.b7#
      • 1...Qxc7
        • 2.bxc7#
      • 1...Qxb6
        • 2.Qxb6#
      • 1...Qa7
        • 2.bxa7#
      • 1...Qb7
        • 2.Qb5#
        • 2.Qa4#
      • 1...Qa8
        • 2.Qxa8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • Q(b);OGATE,XB(D)::QAR1(C),XQ(b)
    • Q(b);OGATE,XP(B)::QAR1(C),XQ(b)
    • Q(b);SBLOCK::QAB(C)
    • Q(b);N_GUARD::QAB(C),XQ(b)
  • Tries
    • Try
      • Q(C);CHECK
      • Refutation
        • Q(b);XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAR(C)+P(B)
    • Vars
      • Q(b);OGATE,XB(D)::QAR(C)+P(B),XQ(b)
      • Q(b);OGATE,P_SPINQ(b),XP(B)::QAR1(C),XQ(b)
      • Q(b);OGATE::QAR(C)+P(B),XQ(b)
      • Q(b);N_GUARD::QAB(C),XQ(b)
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