MESON Chess Problem Database

Problem Display
PID: 137440 (8/7n/7r/R5P1/K5k1/3B1N2/5Q2/8 w - - 0 1)

Lyubashevsky, Leonid Abramovic

2nd Prize, 64 Shakhmatnoe obozrenie, 1974

8/7n/7r/R5P1/K5k1/3B1N2/5Q2/8

#2

6 + 3

6490 yacpdb 2010
9939 64 Shakhmatnoe obozrenie 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kh3
      • 2.Bf5#
    • 1...Kf4
      • 2.Sh2#
    • 1...Kh5
      • 2.Qh4#
  • Tries
    • 1.Bf5+?
      • 1...Kh5
        • 2.Qh4#
        • 2.Qh2#
      • 1...Kf4!
    • 1.Qg1+?
      • 1...Kxf3
        • 2.Rf5#
      • 1...Kh3
        • 2.Bf1#
        • 2.Bf5#
      • 1...Kf4
        • 2.Rf5#
      • 1...Kh5!
    • 1.Qg3+?
      • 1...Kh5
        • 2.Qh4#
        • 2.Qh3#
      • 1...Kxg3!
    • 1.Qg2+?
      • 1...Kh5
        • 2.Qh3#
      • 1...Kf4!
  • Keys
    • 1.Be2!
      • threat
        • 2.Sg1#
      • 1...Kh3
        • 2.Sg1#
      • 1...Kf4
        • 2.Sd2#
      • 1...Kh5
        • 2.Sh4#
      • 1...Sxg5
        • 2.Sxg5#
      • 1...Rh3
        • 2.Sh2#
      • 1...Re6
        • 2.Qh4#
      • 1...Rf6
        • 2.Qh4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(a);S_FLIGHT::B(B)
    • K(a);P-FLIGHT::QAR(A)+S(C)
    • K(a);S_FLIGHT::QAR1(A)
  • Tries
    • Try
      • B(B);CHECK
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);S_FLIGHT,XS(C)::R(E)
        • K(a);P-FLIGHT::R1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Refutation
        • K(a);P-FLIGHT,XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR2(A)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • B(B);
    • Threat
      • B(B)+S(C)
    • Vars
      • K(a);S_FLIGHT::S(C)
      • K(a);P-FLIGHT::QAR(A)+S(C)
      • K(a);S_FLIGHT::B(B)+S(C)
      • S(c);XP(F)::B(B)+S(C),XS(c)
      • R(b);SBLOCK::B(B)+S(C),DCHECK
      • R(b);N_GUARD::QAR1(A)
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