MESON Chess Problem Database

Problem Display
PID: 238139 (8/5p1b/6B1/1Kn1Brpr/1N2kqN1/3pP3/6P1/5Q2 w - - 0 1)

Hermanson, Halvar

Schweizerische Arbeiter Schachzeitung, 1976

8/5p1b/6B1/1Kn1Brpr/1N2kqN1/3pP3/6P1/5Q2

#2

8 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qh2
      • 2.Qf3#
      • 2.Qxf5#
    • 1...Qxe3
      • 2.Qxf5#
    • 1...Qg3
      • 2.Qxf5#
    • 1...Qxe5
      • 2.Qf3#
    • 1...Qf3
      • 2.Qxf3#
      • 2.gxf3#
    • 1...Sb3
      • 2.Qxd3#
    • 1...Sa4
      • 2.Qxd3#
    • 1...Sa6
      • 2.Qxd3#
    • 1...Se6
      • 2.Qxd3#
    • 1...Sb7
      • 2.Qxd3#
    • 1...Sd7
      • 2.Qxd3#
    • 1...d2
      • 2.Qc4#
  • Tries
    • 1.Sf6+?
      • 1...Kxe3
        • 2.Qe1#
      • 1...Kxe5!
    • 1.Qc1?
      • threat
        • 2.Qc4#
      • 1...Qxe3
        • 2.Qxe3#
      • 1...Qxe5
        • 2.Sf2#
      • 1...Sb3
        • 2.Qc6#
      • 1...Se6
        • 2.Qc6#
      • 1...Qxg4!
    • 1.exf4?
      • threat
        • 2.Qe1#
        • 2.Qf3#
      • 1...Rh1
        • 2.Qf3#
      • 1...d2
        • 2.Qe2#
        • 2.Qc4#
        • 2.Qf3#
      • 1...Rh3!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Qd4#
      • 1...Qxe3
        • 2.Sf6#
      • 1...Qxe5
        • 2.Qxe5#
      • 1...Sb3
        • 2.Qa8#
      • 1...Se6
        • 2.Qa8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 0
    • REMOVED MATES = 6
  • Sets
    • Q(c);OGATE,XP(C)::QAB1(A),XR(e)
    • Q(c);OGATE::QAB1(A),XR(e)
    • Q(c);N_GUARD,XB(G)::QAB1(A)
    • S(d);N_GUARD,P_PINB(G)::QAB1(A),XP(a)
    • P(a);OGATE::QAR2(A)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(b);N_SPINR(e),P-FLIGHT,XP(C)::QAR2(A)
      • Refutation
        • K(b);N_SPINR(e),P-FLIGHT,XB(G)
    • Try
      • Q(A);
      • Threat
        • QAR2(A)
      • Vars
        • Q(c);OGATE,XP(C)::QAR1(A),XQ(c)
        • Q(c);N_GUARD,SBLOCK,XB(G)::S(E)
        • S(d);OGATE,P_PINB(G)::QAB(A)
      • Refutation
        • Q(c);XS(E)
    • Try
      • P(C);XQ(c)
      • Threat
        • DUALS(2)
      • Vars
        • R(g);::QAB1(A)
      • Refutation
        • R(g);
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • Q(c);SBLOCK,XP(C)::S(E)
      • Q(c);OGATE,XB(G)::QAR1(A),XQ(c)
      • S(d);N_GUARD,P_PINB(G)::QAB(A)
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