MESON Chess Problem Database

Problem Display
PID: 67025 (8/8/4pQ2/4pN2/1K2k2B/6R1/8/8 w - - 0 1)

Savenok, Aleksandr Antolovich

Troll, 2001

8/8/4pQ2/4pN2/1K2k2B/6R1/8/8

#2

5 + 3

5454 Near Snap 2013
5454 Near Snap 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Kf4
      • 2.Sd6#
  • Tries
    • 1.Kc4?
      • threat
        • 2.Sd6#
      • 1...Kf4
        • 2.Sd6#
      • 1...exf5!
    • 1.Kc5?
      • threat
        • 2.Sd6#
      • 1...Kf4
        • 2.Sd6#
      • 1...exf5!
    • 1.Re3+?
      • 1...Kf4
        • 2.Qg5#
      • 1...Kd5!
    • 1.Qg7?
      • 1...Kf4
        • 2.Qg4#
      • 1...Kd5
        • 2.Qb7#
      • 1...Kxf5
        • 2.Qg4#
      • 1...exf5!
    • 1.Qf8?
      • 1...Kf4
        • 2.Sd6#
      • 1...Kd5
        • 2.Qa8#
      • 1...exf5!
  • Keys
    • 1.Qf7!
      • 1...Kf4
        • 2.Sd6#
      • 1...Kd5
        • 2.Qb7#
      • 1...exf5
        • 2.Qc4#

Anticipated by 9316(1876), 208783(1876), 248226(1880), 182373(1906), 80835(1928), 178142(1959), 79327(1960)

This anticipates 164584(2007)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::QAR(E)+S(D)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Threat
        • S(D)
      • Vars
        • K(a);P-FLIGHT::QAR(E)+S(D)
      • Refutation
        • P(c);XS(D)
    • Try
      • K(B);S_FLIGHT
      • Threat
        • S(D)
      • Vars
        • K(a);P-FLIGHT::QAR(E)+S(D)
      • Refutation
        • P(c);XS(D)
    • Try
      • R(A);CHECK
      • Vars
        • K(a);P-FLIGHT::QAB1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);
      • Vars
        • K(a);P-FLIGHT::QAR1(E)
        • K(a);S_FLIGHT::QAB(E)
        • K(a);S_FLIGHT,XS(D)::QAB1(E)
      • Refutation
        • P(c);XS(D)
    • Try
      • Q(E);
      • Vars
        • K(a);P-FLIGHT::QAR(E)+S(D)
        • K(a);S_FLIGHT::QAB(E)
      • Refutation
        • P(c);XS(D)
  • Actual
    • Q(E);
    • Vars
      • K(a);P-FLIGHT::QAR(E)+S(D)
      • K(a);P_SPINP(c),S_FLIGHT::QAB(E)
      • P(c);OGATE,SBLOCK,XS(D)::QAR2(E)
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