MESON Chess Problem Database

Problem Display
PID: 274339 (4B3/4p3/8/2Kp1k1N/6nR/4pN2/Q7/8 w - - 0 1)

Issler, Werner

Zurcher Woche, 1959

4B3/4p3/8/2Kp1k1N/6nR/4pN2/Q7/8

#2

6 + 5

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Qxd5#
    • 1...Ke6
      • 2.Qxd5#
    • 1...Sf6
      • 2.Sg7#
    • 1...e6
      • 2.Qb1#
      • 2.Qc2#
  • Tries
    • 1.Bg6+?
      • 1...Ke6
        • 2.Qxd5#
      • 1...Kxg6!
    • 1.Bd7+?
      • 1...Ke4
        • 2.Qxd5#
      • 1...e6
        • 2.Qb1#
        • 2.Qc2#
      • 1...Kg6!
    • 1.Bf7?
      • threat
        • 2.Qb1#
        • 2.Qc2#
      • 1...Ke4
        • 2.Qxd5#
      • 1...Sf2
        • 2.Rf4#
      • 1...Se5
        • 2.Rf4#
      • 1...Sf6
        • 2.Sg3#
        • 2.Sg7#
        • 2.Rf4#
      • 1...d4
        • 2.Qe6#
      • 1...e5!
    • 1.Qxd5+?
      • 1...Se5
        • 2.Rf4#
        • 2.Qxe5#
      • 1...e5!
    • 1.Qa6?
      • threat
        • 2.Bg6#
        • 2.Qg6#
      • 1...Se5
        • 2.Sg3#
        • 2.Sg7#
        • 2.Rf4#
      • 1...Sf6
        • 2.Sg3#
        • 2.Sg7#
        • 2.Rf4#
      • 1...e6
        • 2.Qd3#
      • 1...Ke4!
  • Keys
    • 1.Qg2!
      • threat
        • 2.Qxg4#
      • 1...Ke4
        • 2.Bg6#
      • 1...Ke6
        • 2.Qxg4#
      • 1...Sf2
        • 2.Qg6#
      • 1...Sh2
        • 2.Qg6#
      • 1...Se5
        • 2.Sd4#
      • 1...Sf6
        • 2.Sg7#
      • 1...Sh6
        • 2.Qg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(d);P_SPINS(b),S_CUTP(e),S_FLIGHT::QAB1(A),XP(c)
    • K(d);P_SPINP(c),S_CUTP(e),S_CUTS(b),S_FLIGHT::QAB1(A),XP(c)
    • S(b);SBLOCK::S(E)
  • Tries
    • Try
      • B(F);CHECK
      • Vars
        • K(d);N_GUARD,P_SPINP(c),S_FLIGHT::QAB1(A),XP(c)
      • Refutation
        • K(d);S_FLIGHT,XB(F)
    • Try
      • B(F);CHECK
      • Vars
        • K(d);N_GUARD,P_SPINS(b),S_FLIGHT::QAB1(A),XP(c)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • B(F);
      • Threat
        • DUALS(2)
      • Vars
        • K(d);P_SPINS(b),S_CUTP(e),S_FLIGHT::QAB1(A),XP(c)
        • S(b);OGATE::R1(C)
        • P(c);OGATE::QAB1(A)
      • Refutation
        • P(e);
    • Try
      • Q(A);CHECK,XP(c)
      • Refutation
        • P(e);P_SPINP(e)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(e);SBLOCK::QAB(A)
      • Refutation
        • K(d);P_SPINS(b),S_FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAB1(A),XS(b)
    • Vars
      • K(d);N_GUARD,P_SPINS(b),S_FLIGHT::B(F)
      • K(d);S_FLIGHT::QAB(A),XS(b)
      • S(b);OGATE::QAB1(A)
      • S(b);SBLOCK::S(B)
      • S(b);SBLOCK::S(E)
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