MESON Chess Problem Database

Problem Display
PID: 284064 (8/8/8/8/4R3/8/K2N1kr1/5N1Q w - - 0 1)

Lebedev, Leonid Arsentevich

Za Ogneypori, 1989

8/8/8/8/4R3/8/K2N1kr1/5N1Q

#2

5 + 2

3713 Snap 2026

SOLUTION

  • SOUND
  • Sets
    • 1...Rg1
      • 2.Qf3#
    • 1...Rh2
      • 2.Qxh2#
  • Tries
    • 1.Re3?
      • threat
        • 2.Se4#
      • 1...Rg1
        • 2.Qf3#
      • 1...Rg4!
    • 1.Qh4+?
      • 1...Rg3
        • 2.Qxg3#
      • 1...Kg1!
  • Keys
    • 1.Sg3!
      • threat
        • 2.Qe1#
      • 1...Kxg3
        • 2.Qh4#
      • 1...Rxg3
        • 2.Qf1#
      • 1...Rg1
        • 2.Qf3#
      • 1...Rh2
        • 2.Qxh2#

Anticipated by 15889(1988)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(b);OGATE,SBLOCK::QAR1(B)
    • R(b);OGATEB::QAR2(B),XR(b)
  • Tries
    • Try
      • R(E);
      • Threat
        • S(D)
      • Vars
        • R(b);OGATE,SBLOCK::QAR1(B)
      • Refutation
        • R(b);
    • Try
      • Q(B);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAB1(B),XR(b)
      • Refutation
        • K(a);P_PINS(D),S_FLIGHT
  • Actual
    • S(A);
    • Threat
      • QAB1(B)
    • Vars
      • K(a);OGATEB,P_PINS(D),S_FLIGHT,XS(A)::QAB1(B)
      • R(b);SBLOCK,XS(A)::QAR1(B)
      • R(b);OGATE,SBLOCK::QAR1(B)
      • R(b);OGATEB::QAR2(B),XR(b)
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