MESON Chess Problem Database

Problem Display
PID: 245207 (7Q/2B5/1N6/kp6/N7/3K4/8/8 w - - 0 1)

Shanshin, Valery Yurevich

Smena (Moscow), 2000

7Q/2B5/1N6/kp6/N7/3K4/8/8

#2

5 + 2

5454 Near Snap 2021
15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kb4
      • 2.Qc3#
    • 1...Ka6
      • 2.Qa8#
  • Tries
    • 1.Sb2?
      • 1...Kb4
        • 2.Qc3#
      • 1...Ka6
        • 2.Qa8#
      • 1...b4!
    • 1.Sc3?
      • 1...Ka6
        • 2.Qa8#
      • 1...b4
        • 2.Qa8#
      • 1...Kb4!
    • 1.Sc5?
      • threat
        • 2.Sd5#
      • 1...Kb4
        • 2.Qc3#
      • 1...b4!
    • 1.Sd5+?
      • 1...Ka6
        • 2.Qa8#
      • 1...Kxa4!
    • 1.Qe5?
      • 1...Kb4
        • 2.Qc3#
      • 1...Ka6!
  • Keys
    • 1.Qa1!
      • 1...Kb4
        • 2.Qc3#
      • 1...Ka6
        • 2.Sc5#
      • 1...bxa4
        • 2.Qxa4#
      • 1...b4
        • 2.Sc3#

Anticipated by 21309(1918), 77239(1927), 102513(1964), 12404(1978), 150698(1982), 79321(1988), 203054(1990)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::QAB1(E)
    • K(a);P-FLIGHT::QAR2(E)
  • Tries
    • Try
      • S(B);
      • Vars
        • K(a);S_FLIGHT::QAB1(E)
        • K(a);P-FLIGHT::QAR2(E)
      • Refutation
        • P(b);
    • Try
      • S(B);
      • Vars
        • K(a);P-FLIGHT::QAR2(E)
        • P(b);SBLOCK::QAR(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(B);
      • Threat
        • B(D)+S(C)
      • Vars
        • K(a);S_FLIGHT::QAB1(E)
      • Refutation
        • P(b);
    • Try
      • S(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR2(E)
      • Refutation
        • K(a);P-FLIGHT,XS(B)
    • Try
      • Q(E);P_PINP(b)
      • Vars
        • K(a);N_SPINP(b),S_FLIGHT::QAB1(E)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT
  • Actual
    • Q(E);
    • Vars
      • K(a);S_FLIGHT::QAB1(E)
      • K(a);P-FLIGHT::QAR(E)+S(B),DCHECK
      • P(b);OGATE,P_SPINP(b),XS(B)::QAR1(E),XP(b)
      • P(b);SBLOCK::QAR(E)+S(B)
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Developed and maintained by Brian Stephenson.
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