MESON Chess Problem Database

Problem Display
PID: 172248 (nK1kb3/3pp3/7Q/8/8/8/8/8 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kubanski krai, 1996

nK1kb3/3pp3/7Q/8/8/8/8/8

#2

2 + 5

6490 yacpdb 2018
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sb6
      • 2.Qxb6#
    • 1...e5
      • 2.Qg5#
      • 2.Qh4#
      • 2.Qf6#
    • 1...e6
      • 2.Qg5#
      • 2.Qh4#
      • 2.Qf6#
  • Tries
    • 1.Qa6?
      • threat
        • 2.Qc8#
      • 1...e5
        • 2.Qf6#
      • 1...Sb6
        • 2.Qxb6#
      • 1...e6!
    • 1.Qb6+?
      • 1...Sc7
        • 2.Qxc7#
      • 1...Sxb6!
  • Keys
    • 1.Qc1!
      • threat
        • 2.Qc8#
      • 1...e5
        • 2.Qg5#
      • 1...e6
        • 2.Qg5#
      • 1...Sb6
        • 2.Qc7#
      • 1...Sc7
        • 2.Qxc7#

This anticipates 169015(2017)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD::QAB(A),XS(c)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • P(b);OGATEB::QAB(A)
        • S(c);N_GUARD::QAB(A),XS(c)
      • Refutation
        • P(b);
    • Try
      • Q(A);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAB1(A),XS(c)
      • Refutation
        • S(c);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • P(b);OGATEB::QAB(A)
      • S(c);N_GUARD::QAB1(A)
      • S(c);N_GUARD::QAB1(A),XS(c)
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