MESON Chess Problem Database

Problem Display
PID: 180417 (5nB1/8/K3P3/1P1P1Q2/2kP1p1R/R1pN1NP1/8/8 w - - 0 1)

Lider, Valentin Viktorovich

3rd Prize, 64 Shakhmatnoe obozrenie, 1973

5nB1/8/K3P3/1P1P1Q2/2kP1p1R/R1pN1NP1/8/8

#2

12 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Sb2+?
      • 1...Kb4
        • 2.Qxf8#
      • 1...cxb2!
    • 1.Sc5?
      • threat
        • 2.Ra4#
      • 1...Kb4
        • 2.Ra4#
      • 1...c2!
    • 1.Sde5+?
      • 1...Kb4
        • 2.Qxf8#
      • 1...Kxd5!
    • 1.Sd2+?
      • 1...Kxd4
        • 2.Qe4#
      • 1...cxd2!
    • 1.e7?
      • 1...fxg3
        • 2.Sfe5#
      • 1...c2
        • 2.Qc8#
      • 1...Sg6
        • 2.d6#
      • 1...Sd7
        • 2.d6#
      • 1...Sh7
        • 2.d6#
      • 1...Se6!
  • Keys
    • 1.d6!
      • 1...Sxe6
        • 2.Bxe6#
      • 1...fxg3
        • 2.d5#
      • 1...c2
        • 2.Qc5#
      • 1...Sg6
        • 2.e7#
      • 1...Sd7
        • 2.exd7#
        • 2.e7#
      • 1...Sh7
        • 2.e7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB(I),XS(d)
      • Refutation
        • P(a);XS(B)
    • Try
      • S(B);
      • Threat
        • R(A)
      • Vars
        • K(b);P-FLIGHT::R1(A)
      • Refutation
        • P(a);
    • Try
      • S(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAB(I),XS(d)
      • Refutation
        • K(b);S_FLIGHT,XP(H)
    • Try
      • S(C);CHECK
      • Vars
        • K(b);P-FLIGHT,P_SPINP(c),XP(E)::QAR1(I)
      • Refutation
        • P(a);XS(C)
    • Try
      • P(K);
      • Vars
        • P(c);XP(D)::S(C)
        • P(a);::QAR(I)
        • S(d);N_GUARD::B(L)+P(H)
      • Refutation
        • S(d);
  • Actual
    • P(H);
    • Vars
      • S(d);OGATE,P_SPINS(d),XP(K)::B(L),XS(d)
      • P(c);XP(D)::R(F)+P(E)
      • P(a);::QAR1(I)
      • S(d);N_GUARD::B(L)+P(K)
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