MESON Chess Problem Database

Problem Display
PID: 139248 (qn6/8/3b4/1Rp4p/2p1k3/7Q/4NP2/B2R1K2 w - - 0 1)

Levman, Semyon Semyonovich

The Problemist, 1937

qn6/8/3b4/1Rp4p/2p1k3/7Q/4NP2/B2R1K2

#2

7 + 7

SOLUTION

  • SOUND
  • Tries
    • 1.Rd4+?
      • 1...cxd4
        • 2.Qf5#
      • 1...Ke5!
    • 1.Rb3?
      • threat
        • 2.Re3#
        • 2.Qf3#
        • 2.f3#
      • 1...Qxa1
        • 2.Re3#
      • 1...cxb3
        • 2.Qd3#
      • 1...Qa3
        • 2.Qf3#
        • 2.f3#
      • 1...Bg3
        • 2.Re3#
        • 2.f3#
      • 1...Bf4
        • 2.f3#
      • 1...c3!
    • 1.Qg4+?
      • 1...Bf4
        • 2.Sg3#
        • 2.Qxf4#
      • 1...hxg4!
    • 1.Qh4+?
      • 1...Kf3
        • 2.Sg1#
      • 1...Bf4
        • 2.Qxf4#
      • 1...Kf5!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Qf5#
      • 1...Kf4
        • 2.Qf5#
      • 1...Kd5
        • 2.Qe6#
      • 1...Ke5
        • 2.Qf5#
      • 1...Qd5
        • 2.Qe3#
      • 1...Be5
        • 2.Qf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • P(c);XR(B)::QAB1(F)
      • Refutation
        • K(b);P-FLIGHT,P_SPINP(c)
    • Try
      • R(G);
      • Threat
        • DUALS(3)
      • Vars
        • Q(f);P_PINR(B),XB(A)::R1(G)
        • P(a);N_GUARD,XR(G)::QAB1(F)
        • B(e);::P(E)
      • Refutation
        • P(a);
    • Try
      • Q(F);CHECK
      • Refutation
        • P(d);XQ(F)
    • Try
      • Q(F);CHECK
      • Vars
        • K(b);S_FLIGHT::S(D)
        • B(e);N_GUARD,P_SPINB(e)::QAR1(F),XB(e)
      • Refutation
        • K(b);P_SPINP(c),S_FLIGHT
  • Actual
    • S(D);
    • Threat
      • QAB1(F)
    • Vars
      • K(b);P-FLIGHT::QAR1(F)
      • K(b);P_SPINP(c),S_FLIGHT::QAB1(F)
      • K(b);P-FLIGHT,P_SPINP(c)::QAR1(F)
      • Q(f);SBLOCK::QAR1(F)
      • B(e);SBLOCK::QAB1(F)
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