MESON Chess Problem Database

Problem Display
PID: 249956 (7K/6pR/2Q2Rp1/3n2k1/8/8/4p2N/bB6 w - - 0 1)

Podushkin, S

Stella Polaris, 1969

7K/6pR/2Q2Rp1/3n2k1/8/8/4p2N/bB6

#2

6 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Sxf6
      • 2.Qc1#
  • Tries
    • 1.Rf3?
      • threat
        • 2.Qxg6#
      • 1...Sf4
        • 2.Rg3#
      • 1...Sf6
        • 2.Qc1#
      • 1...Se7
        • 2.Qc1#
      • 1...Bf6!
    • 1.Qxd5+?
      • 1...Be5
        • 2.Qxe5#
      • 1...Kxf6!
    • 1.Qe6?
      • threat
        • 2.Sf3#
      • 1...Bxf6
        • 2.Qg4#
      • 1...Sxf6
        • 2.Qe3#
      • 1...gxf6
        • 2.Qg4#
      • 1...e1S!
  • Keys
    • 1.Qd6!
      • threat
        • 2.Rxg6#
      • 1...Bxf6
        • 2.Qg3#
      • 1...Sxf6
        • 2.Qd2#
      • 1...gxf6
        • 2.Qg3#
      • 1...Be5
        • 2.Qxe5#
      • 1...Sf4
        • 2.Qxf4#
      • 1...Se7
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD,SBLOCK,XR(D)::QAB(C)
  • Tries
    • Try
      • R(D);
      • Threat
        • QAR1(C),XP(e)
      • Vars
        • S(c);SBLOCK::R(D)
        • S(c);N_GUARD::QAB(C)
      • Refutation
        • B(a);
    • Try
      • Q(C);CHECK,XS(c)
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAR2(C),XB(a)
      • Refutation
        • K(d);S_FLIGHT,XR(D)
    • Try
      • Q(C);
      • Threat
        • S(B)
      • Vars
        • B(a);SBLOCK,XR(D)::QAR1(C)
        • S(c);N_GUARD,SBLOCK,XR(D)::QAB(C)
        • P(f);SBLOCK,XR(D)::QAR1(C)
      • Refutation
        • P(b);
  • Actual
    • Q(C);
    • Threat
      • R1(D),XP(e)
    • Vars
      • B(a);SBLOCK,XR(D)::QAR2(C)
      • S(c);OGATE,SBLOCK,XR(D)::QAB(C)
      • P(f);SBLOCK,XR(D)::QAR2(C)
      • B(a);N_GUARD::QAR2(C),XB(a)
      • S(c);N_GUARD::QAB1(C),XS(c)
      • S(c);N_GUARD::QAB1(C)
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