MESON Chess Problem Database

Problem Display
PID: 284336 (8/8/3N4/8/Q7/B7/kp6/b2K4 w - - 0 1)

Lebedev, Aleksandr N

British Chess Magazine, 1936

8/8/3N4/8/Q7/B7/kp6/b2K4

#2

4 + 3

3713 Snap 2026

SOLUTION

  • SOUND
  • Sets
    • 1...b1Q+
      • 2.Bc1#
    • 1...b1B
      • 2.Bc1#
    • 1...b1R+
      • 2.Bc1#
  • Tries
    • 1.Se4?
      • threat
        • 2.Sc3#
      • 1...b1Q+
        • 2.Bc1#
      • 1...b1R+
        • 2.Bc1#
      • 1...Kb1
        • 2.Sc3#
      • 1...b1B
        • 2.Bc1#
      • 1...b1S!
    • 1.Bxb2+?
      • 1...Kb1
        • 2.Qxa1#
      • 1...Kxb2!
    • 1.Qc4+?
      • 1...Kxa3
        • 2.Sb5#
      • 1...Kb1!
  • Keys
    • 1.Sb5!
      • threat
        • 2.Sc3#
      • 1...b1Q+
        • 2.Bc1#
      • 1...b1R+
        • 2.Bc1#
      • 1...Kb1
        • 2.Sc3#
      • 1...b1S
        • 2.Qc4#
      • 1...b1B
        • 2.Bc1#
        • 2.Qc4#

Anticipated by 6876(1934)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • P(c);CHECK,OGATE,SBLOCK::QAR(C)+B(B)
    • P(c);OGATE,SBLOCK::QAR(C)+B(B)
  • Tries
    • Try
      • S(D);
      • Threat
        • S(D)
      • Vars
        • P(c);CHECK,OGATE,SBLOCK::QAR(C)+B(B)
        • K(b);S_FLIGHT::S(D)
        • P(c);OGATE,SBLOCK::QAR(C)+B(B)
      • Refutation
        • P(c);
    • Try
      • B(B);CHECK,XP(c)
      • Vars
        • K(b);OGATE,S_FLIGHT::QAR1(C),XB(a)
      • Refutation
        • K(b);P-FLIGHT,XB(B)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);N_GUARD,P-FLIGHT,XB(B)::S(D)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • P(c);CHECK,OGATE,SBLOCK::QAR(C)+B(B)
      • K(b);S_FLIGHT::S(D)
      • P(c);SBLOCK::QAB(C)
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