MESON Chess Problem Database

Problem Display
PID: 73411 (2K2b2/1pN5/3pQ1p1/R2Pp3/1q1k3r/R1N2r2/1B3Pn1/5B2 w - - 0 1)

Kubbel, Leonid Ivanovich (AKA Kubbel, Karl Artur Leonid)

4th HM., Aachener Anzeiger, 1929

2K2b2/1pN5/3pQ1p1/R2Pp3/1q1k3r/R1N2r2/1B3Pn1/5B2

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc3
      • 2.R3a4#
    • 1...Qa4
      • 2.R3xa4#
  • Tries
    • 1.Qg4+?
      • 1...Rf4
        • 2.Se6#
        • 2.Qd1#
      • 1...Rxg4
        • 2.Se6#
      • 1...Sf4
        • 2.Se6#
      • 1...e4!
    • 1.Qxe5+?
      • 1...dxe5
        • 2.Se6#
      • 1...Kxe5!
    • 1.Qxg6?
      • threat
        • 2.Se6#
      • 1...Qxc3
        • 2.R3a4#
      • 1...Rxf2
        • 2.Qd3#
      • 1...Rxc3
        • 2.Qd3#
      • 1...Rd3
        • 2.Qxd3#
      • 1...Qc5
        • 2.Sb5#
      • 1...Qc4
        • 2.Se2#
      • 1...Rf6
        • 2.Qd3#
      • 1...Sf4
        • 2.Qe4#
      • 1...e4!
  • Keys
    • 1.Qf5!
      • threat
        • 2.Se6#
      • 1...Qxc3
        • 2.R3a4#
      • 1...Rxf2
        • 2.Qd3#
      • 1...Rxc3
        • 2.Qd3#
      • 1...Rd3
        • 2.Qxd3#
      • 1...Qc5
        • 2.Sb5#
      • 1...Qc4
        • 2.Se2#
      • 1...Sf4
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • Q(c);OGATEB,P_PINS(I),P_SPINQ(c),XS(E)::R(D)
    • Q(c);OGATEB::R(D),XQ(c)
  • Tries
    • Try
      • Q(H);CHECK
      • Vars
        • R(e);XQ(H)::S(I)
        • S(a);P_SPINS(a)::S(I)
      • Refutation
        • P(f);P_SPINP(f)
    • Try
      • Q(H);CHECK,XP(f)
      • Vars
        • P(g);SBLOCK,XQ(H)::S(I)
      • Refutation
        • K(d);S_FLIGHT,XQ(H)
    • Try
      • Q(H);XP(h)
      • Threat
        • S(I)
      • Vars
        • Q(c);OGATEB,P_PINS(I),P_SPINQ(c),XS(E)::R(D)
        • R(b);N_GUARD,XP(C)::QAR1(H)
        • R(b);N_GUARD,P_PINS(I),P_SPINR(b),XS(E)::QAR1(H)
        • R(b);N_GUARD::QAR1(H),XR(b)
        • Q(c);P_PINS(I),SBLOCK::B(B)+S(E),DCHECK
        • R(b);N_GUARD::QAR1(H)
        • S(a);S_CUTR(e)::QAR1(H)
      • Refutation
        • P(f);
  • Actual
    • Q(H);
    • Threat
      • S(I)
    • Vars
      • Q(c);OGATEB,P_PINS(I),P_SPINQ(c),XS(E)::R(D)
      • R(b);N_GUARD,XP(C)::QAR1(H)
      • R(b);N_GUARD,P_PINS(I),P_SPINR(b),XS(E)::QAR1(H)
      • R(b);N_GUARD::QAR1(H),XR(b)
      • Q(c);P_PINS(I),SBLOCK::B(B)+S(E),DCHECK
      • S(a);S_CUTR(e)::QAR1(H)
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