MESON Chess Problem Database

Problem Display
PID: 177531 (5q2/3Q4/4Nk2/7P/4R2K/8/8/8 w - - 0 1)

Jonsson, Christer

Postsjakk, 1975

5q2/3Q4/4Nk2/7P/4R2K/8/8/8

#2

5 + 2

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Qd4+?
      • 1...Kf5
        • 2.Qe5#
      • 1...Ke7
        • 2.Sg5#
        • 2.Sd8#
      • 1...Kf7!
    • 1.Qg7+?
      • 1...Kf5
        • 2.Re5#
        • 2.Qe5#
        • 2.Qg6#
      • 1...Qxg7!
  • Keys
    • 1.Sg7!
      • threat
        • 2.Re6#
      • 1...Qxg7
        • 2.Qe6#
      • 1...Qe7
        • 2.Qxe7#
      • 1...Qf7
        • 2.Qd4#
      • 1...Qb4
        • 2.Se8#
      • 1...Qd6
        • 2.Se8#
      • 1...Qe8
        • 2.Sxe8#
      • 1...Qg8
        • 2.Qe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(E)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(E);CHECK
      • Refutation
        • Q(b);XQ(E)
  • Actual
    • S(D);
    • Threat
      • R1(A)
    • Vars
      • Q(b);SBLOCK,XS(D)::QAR1(E)
      • Q(b);N_GUARD::QAB1(E),XQ(b)
      • Q(b);SBLOCK::QAB(E)
      • Q(b);N_GUARD,P_PINR(A)::S(D)
      • Q(b);N_GUARD::S(D)
      • Q(b);N_GUARD::S(D),XQ(b)
      • Q(b);N_GUARD::QAB1(E)
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