MESON Chess Problem Database

Problem Display
PID: 200654 (8/3p1q2/1K1p1PR1/1P1k1NNR/6r1/2QPPb1B/8/6n1 w - - 0 1)

Klun, Joseph

Stella Polaris, 1967

8/3p1q2/1K1p1PR1/1P1k1NNR/6r1/2QPPb1B/8/6n1

#2

11 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg6
      • 2.Se7#
    • 1...Qg8
      • 2.Se7#
    • 1...Qe7
      • 2.Sxe7#
    • 1...Rg2
      • 2.Qd4#
    • 1...Rg3
      • 2.Qd4#
    • 1...Rc4
      • 2.dxc4#
    • 1...Rd4
      • 2.Qxd4#
    • 1...Be4
      • 2.Qd4#
  • Tries
    • 1.Sxd6?
      • threat
        • 2.Qc5#
      • 1...Kxd6
        • 2.Qc5#
      • 1...Rc4!
    • 1.Bxg4?
      • threat
        • 2.Qd4#
      • 1...Se2
        • 2.Bxf3#
      • 1...Qxf6!
    • 1.Qb3+?
      • 1...Ke5
        • 2.Sxf7#
      • 1...Rc4!
    • 1.Qc4+?
      • 1...Ke5
        • 2.Sxf7#
      • 1...Rxc4!
    • 1.e4+?
      • 1...Bxe4
        • 2.Se3#
        • 2.Qd4#
      • 1...Rxe4!
  • Keys
    • 1.Se6!
      • threat
        • 2.Sc7#
      • 1...Kxe6
        • 2.Sd4#
      • 1...Qxe6
        • 2.Se7#
      • 1...dxe6
        • 2.Se7#
      • 1...Rd4
        • 2.Se7#
      • 1...Rc4
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • Q(g);N_GUARD,XR(K)::S(F)
    • Q(g);N_GUARD::S(F)
    • Q(g);N_GUARD::S(F),XQ(g)
    • R(c);N_GUARD::QAR1(A)
    • R(c);OGATE::P(B),XR(c)
    • R(c);N_GUARD::QAR1(A),XR(c)
    • B(b);S_CUTR(c)::QAR1(A)
  • Tries
    • Try
      • S(F);XP(e)
      • Threat
        • QAR1(A)
      • Vars
        • K(d);P-FLIGHT,XS(F)::QAB1(A)
      • Refutation
        • R(c);
    • Try
      • B(D);XR(c)
      • Threat
        • QAR1(A)
      • Vars
        • S(a);N_GUARD::B(D),XB(b)
      • Refutation
        • Q(g);XP(J)
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);P-FLIGHT::S(G),XQ(g)
      • Refutation
        • R(c);P_SPINR(c)
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);P-FLIGHT::S(G),XQ(g)
      • Refutation
        • R(c);XQ(A)
    • Try
      • P(C);CHECK
      • Refutation
        • R(c);XP(C)
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • K(d);S_FLIGHT,XS(G)::S(F)
      • Q(g);SBLOCK,XS(G)::R(H)+S(F),DCHECK
      • P(f);SBLOCK,XS(G)::R(H)+S(F),DCHECK
      • R(c);::R(H)+S(F),DCHECK
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