MESON Chess Problem Database

Problem Display
PID: 12438 (1K1k4/2pppB2/8/8/8/8/Q7/8 w - - 0 1)

Shedey, Sergey Oleksandrovich

Leninskaya Smena, 1979

1K1k4/2pppB2/8/8/8/8/Q7/8

#2

3 + 4

3296 Shakhmatny zadachi miniaturi 1987
2838 Fun with Chess Miniatures 1996
145 StrateGems 2009
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...c5
      • 2.Qa5#
    • 1...c6
      • 2.Qa5#
    • 1...d5
      • 2.Qxd5#
  • Tries
    • 1.Qd2?
      • 1...d5
        • 2.Qxd5#
      • 1...e5
        • 2.Qg5#
      • 1...e6
        • 2.Qg5#
      • 1...c6
        • 2.Qa5#
      • 1...c5
        • 2.Qa5#
      • 1...d6!
    • 1.Qg2?
      • threat
        • 2.Qg8#
      • 1...d5
        • 2.Qxd5#
      • 1...e5
        • 2.Qg5#
      • 1...e6
        • 2.Qg5#
      • 1...d6!
    • 1.Qh2?
      • threat
        • 2.Qxc7#
        • 2.Qh8#
      • 1...d5
        • 2.Qxc7#
      • 1...e5
        • 2.Qh4#
      • 1...e6
        • 2.Qh4#
      • 1...c6
        • 2.Qc7#
        • 2.Qh8#
      • 1...c5
        • 2.Qc7#
        • 2.Qh8#
      • 1...d6!
    • 1.Qa5?
      • threat
        • 2.Qxc7#
      • 1...e6
        • 2.Qg5#
      • 1...e5!
    • 1.Qa6?
      • threat
        • 2.Qc8#
      • 1...e5
        • 2.Qf6#
      • 1...e6!
  • Keys
    • 1.Qa4!
      • 1...e5
        • 2.Qh4#
      • 1...e6
        • 2.Qh4#
      • 1...c6
        • 2.Qa5#
      • 1...c5
        • 2.Qa5#
      • 1...d5
        • 2.Qe8#
      • 1...d6
        • 2.Qe8#

This anticipates 134628(2009)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATEB::QAB(A)
    • P(b);OGATEB::QAR(A),XP(b)
  • Tries
    • Try
      • Q(A);P_PINP(b)
      • Vars
        • P(b);OGATEB::QAR(A),XP(b)
        • P(c);OGATEB::QAB(A)
        • P(a);OGATEB::QAB(A)
      • Refutation
        • P(b);
    • Try
      • Q(A);
      • Threat
        • QAR(A)
      • Vars
        • P(b);OGATEB::QAR(A),XP(b)
        • P(c);OGATEB::QAB(A)
      • Refutation
        • P(b);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);::QAB1(A),XP(a)
        • P(c);OGATEB::QAB(A)
      • Refutation
        • P(b);
    • Try
      • Q(A);P_PINP(a)
      • Threat
        • QAB1(A),XP(a)
      • Vars
        • P(c);OGATEB::QAB(A)
      • Refutation
        • P(c);
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • P(c);OGATEB::QAB(A)
      • Refutation
        • P(c);
  • Actual
    • Q(A);
    • Vars
      • P(c);OGATEB::QAB(A)
      • P(a);OGATEB::QAB(A)
      • P(b);OGATE::QAR1(A)
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