MESON Chess Problem Database

Problem Display
PID: 141839 (2K5/1pp1p3/3k4/5RQ1/8/8/8/8 w - - 0 1)

Yanovich, I

Shakhmaty v SSSR, 1954

2K5/1pp1p3/3k4/5RQ1/8/8/8/8

#2

3 + 4

3713 Snap 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Ke6
      • 2.Qg6#
  • Tries
    • 1.Rc5?
      • threat
        • 2.Qd5#
        • 2.Qe5#
      • 1...Ke6
        • 2.Qg6#
      • 1...e5
        • 2.Qxe5#
      • 1...c6
        • 2.Qe5#
      • 1...e6!
    • 1.Rd5+?
      • 1...Ke6
        • 2.Qf5#
      • 1...Kc6!
    • 1.Qd2+?
      • 1...Ke6
        • 2.Qd5#
        • 2.Qd7#
      • 1...Kc6!
    • 1.Qf4+?
      • 1...Kc6
        • 2.Qxc7#
      • 1...Ke6
        • 2.Qe5#
      • 1...e5!
    • 1.Qxe7+?
      • 1...Kc6
        • 2.Qc5#
        • 2.Qf6#
        • 2.Qe6#
        • 2.Qxc7#
      • 1...Kxe7!
    • 1.Qg3+?
      • 1...Kc6
        • 2.Qxc7#
      • 1...Ke6
        • 2.Qe5#
        • 2.Qg6#
      • 1...e5!
  • Keys
    • 1.Rb5!
      • threat
        • 2.Qd5#
      • 1...Kc6
        • 2.Qc5#
        • 2.Qd5#
      • 1...Ke6
        • 2.Qg6#
      • 1...c5
        • 2.Rb6#
      • 1...c6
        • 2.Qe5#
      • 1...e5
        • 2.Qf6#
      • 1...e6
        • 2.Qc5#

This anticipates 15624(1986)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::QAR2(B)
  • Tries
    • Try
      • R(A);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);P-FLIGHT::QAR2(B)
        • P(d);::QAB1(B),XP(d)
        • P(c);::QAB1(B)
      • Refutation
        • P(d);
    • Try
      • R(A);CHECK
      • Vars
        • K(a);P-FLIGHT::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT::QAR1(B),XP(c)
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • P(d);P_SPINP(d)
    • Try
      • Q(B);CHECK,XP(d)
      • Refutation
        • K(a);S_FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT::QAR1(B),XP(c)
      • Refutation
        • P(d);P_SPINP(d)
  • Actual
    • R(A);
    • Threat
      • QAR1(B)
    • Vars
      • K(a);P-FLIGHT::QAR2(B)
      • P(c);N_GUARD::R(A)
      • P(c);SBLOCK::QAB1(B)
      • P(d);N_GUARD::QAR2(B)
      • P(d);SBLOCK::QAB1(B)
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