MESON Chess Problem Database

Problem Display
PID: 9943 (8/4K2n/4p1p1/1nQ4b/5k1p/1r3PR1/7q/5NN1 w - - 0 1)

Knoppel, Jan Heribert

2nd Place, Tidskrift for Schack, 1960

8/4K2n/4p1p1/1nQ4b/5k1p/1r3PR1/7q/5NN1

#2

6 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qh1
      • 2.Se2#
    • 1...Qa2
      • 2.Sh3#
    • 1...Qb2
      • 2.Sh3#
    • 1...Qc2
      • 2.Sh3#
    • 1...Qd2
      • 2.Sh3#
    • 1...Qe2
      • 2.Sxe2#
      • 2.Sh3#
    • 1...Qf2
      • 2.Sh3#
    • 1...Qh3
      • 2.Se2#
      • 2.Sxh3#
    • 1...Bg4
      • 2.Rxg4#
    • 1...Sg5
      • 2.Qxg5#
    • 1...Sf6
      • 2.Qg5#
    • 1...Sf8
      • 2.Qg5#
  • Tries
    • 1.Qe3+?
      • 1...Kf5
        • 2.Qe4#
      • 1...Rxe3!
    • 1.Qd4+?
      • 1...Kf5
        • 2.Qe4#
      • 1...Sxd4!
    • 1.Qc4+?
      • 1...Ke5
        • 2.Qe4#
      • 1...Kf5
        • 2.Qe4#
      • 1...Sd4!
  • Keys
    • 1.Kxe6!
      • threat
        • 2.Qe5#
      • 1...Qe2+
        • 2.Sxe2#
      • 1...Qh3+
        • 2.Sxh3#
      • 1...Re3+
        • 2.Qxe3#
      • 1...Bg4+
        • 2.Rxg4#
      • 1...Sd4+
        • 2.Qxd4#
      • 1...Sc7+
        • 2.Qxc7#
      • 1...Sg5+
        • 2.Qxg5#
      • 1...Sf8+
        • 2.Qxf8#
      • 1...Qb2
        • 2.Sh3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 6
  • Sets
    • Q(a);N_GUARD::S(B)
    • B(f);N_GUARD::R1(D),XB(f)
    • S(i);N_GUARD::QAB1(E),XS(i)
    • S(i);N_GUARD::QAB1(E)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • K(c);P-FLIGHT::QAB1(E)
      • Refutation
        • R(b);XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • K(c);P-FLIGHT::QAB1(E)
      • Refutation
        • S(e);XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • K(c);S_FLIGHT::QAR1(E)
        • K(c);P-FLIGHT::QAB1(E)
      • Refutation
        • S(e);P_SPINS(e)
  • Actual
    • K(F);P-FLIGHT,XP(g)
    • Threat
      • QAB1(E)
    • Vars
      • Q(a);CHECK,N_GUARD::S(B),XQ(a)
      • R(b);CHECK,N_GUARD::QAB1(E),XR(b)
      • B(f);CHECK,N_GUARD::R1(D),XB(f)
      • S(e);CHECK,N_GUARD::QAR2(E),XS(e)
      • S(e);CHECK,N_GUARD::QAB(E),XS(e)
      • S(i);CHECK,N_GUARD::QAB1(E),XS(i)
      • S(i);CHECK,N_GUARD::QAR(E),XS(i)
      • Q(a);N_GUARD::S(B)
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