MESON Chess Problem Database

Problem Display
PID: 6671 (3qN3/1R5r/4k3/3N4/B2KP3/8/Q7/8 w - - 0 1)

Hermanson, Halvar

1st Prize, Schackvarlden, 1932

3qN3/1R5r/4k3/3N4/B2KP3/8/Q7/8

#2

7 + 3

371 The Chess Review 1933
3310 2345 Chess Problems 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Qh4
      • 2.Sc3#
      • 2.Se3#
      • 2.Sb4#
      • 2.Sf4#
      • 2.Sb6#
      • 2.Sdf6#
      • 2.Se7#
    • 1...Qa5
      • 2.Sf4#
    • 1...Qg5
      • 2.Sf4#
    • 1...Qb6+
      • 2.Sxb6#
    • 1...Qf6+
      • 2.Sdxf6#
    • 1...Qe7
      • 2.Sc3#
      • 2.Se3#
      • 2.Sb4#
      • 2.Sf4#
      • 2.Sb6#
      • 2.Sdf6#
      • 2.Sdc7#
      • 2.Sxe7#
    • 1...Qxd5+
      • 2.Qxd5#
    • 1...Qa8
      • 2.Sc3#
      • 2.Se3#
      • 2.Sb4#
      • 2.Sf4#
      • 2.Sb6#
      • 2.Sdf6#
      • 2.Se7#
    • 1...Qb8
      • 2.Sc3#
      • 2.Se3#
      • 2.Sb4#
      • 2.Sf4#
      • 2.Sb6#
      • 2.Sdf6#
      • 2.Se7#
    • 1...Qc8
      • 2.Sf4#
  • Tries
    • 1.Sg7+?
      • 1...Kd6
        • 2.Qa3#
        • 2.e5#
      • 1...Rxg7!
    • 1.Re7+?
      • 1...Qxe7
        • 2.Sc3#
        • 2.Se3#
        • 2.Sb4#
        • 2.Sf4#
        • 2.Sb6#
        • 2.Sdf6#
        • 2.Sdc7#
      • 1...Rxe7!
  • Keys
    • 1.Qf2!
      • threat
        • 2.Qf5#
      • 1...Qb6+
        • 2.Rxb6#
      • 1...Qf6+
        • 2.Qxf6#
      • 1...Qxd5+
        • 2.exd5#
      • 1...Qxe8
        • 2.Qf6#
      • 1...Qg5
        • 2.Rb6#
      • 1...Rh5
        • 2.Qf7#
      • 1...Rf7
        • 2.Qxf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • Q(c);N_PINS(E)::QAB(A)+S(E),DCHECK
    • Q(c);CHECK,N_PINS(E)::QAB(A)+S(E),XQ(c)
    • Q(c);CHECK,OGATE,P_SPINQ(c),XS(E)::QAB1(A),XQ(c)
  • Tries
    • Try
      • S(G);CHECK
      • Refutation
        • R(b);XS(G)
    • Try
      • R(F);CHECK
      • Refutation
        • R(b);XR(F)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • Q(c);CHECK,N_GUARD,N_PINS(E)::R(F),XQ(c)
      • Q(c);CHECK,N_GUARD,N_PINS(E)::QAR1(A),XQ(c)
      • Q(c);CHECK,OGATE,XS(E)::P(D),XQ(c)
      • Q(c);N_GUARD,N_PINS(E),XS(G)::QAR1(A)
      • Q(c);N_GUARD,N_PINS(E)::R(F)
      • R(b);N_GUARD::QAB1(A)
      • R(b);N_GUARD::QAB1(A),XR(b)
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