MESON Chess Problem Database

Problem Display
PID: 238122 (4Bn2/1N2p3/3Nk3/4p2K/4P1pB/6p1/3n1q2/5Q2 w - - 0 1)

Hermanson, Halvar

Schach, 1970

4Bn2/1N2p3/3Nk3/4p2K/4P1pB/6p1/3n1q2/5Q2

#2

7 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qe1
      • 2.Qf5#
      • 2.Qf7#
    • 1...Qg1
      • 2.Qf5#
      • 2.Qf7#
    • 1...Qe3
      • 2.Qf5#
      • 2.Qf7#
    • 1...Qd4
      • 2.Qf5#
      • 2.Qf7#
    • 1...Qc5
      • 2.Qf5#
      • 2.Qf7#
    • 1...Qb6
      • 2.Qf5#
      • 2.Qf7#
    • 1...Qa7
      • 2.Qf5#
      • 2.Qf7#
    • 1...Qe2
      • 2.Qf5#
      • 2.Qf7#
    • 1...Qg2
      • 2.Qf5#
      • 2.Qf7#
    • 1...Qh2
      • 2.Qf5#
      • 2.Qf7#
    • 1...Qf5+
      • 2.Qxf5#
    • 1...Qf7+
      • 2.Qxf7#
    • 1...Sb1
      • 2.Qc4#
    • 1...Sb3
      • 2.Qc4#
    • 1...Sf3
      • 2.Qc4#
    • 1...Sc4
      • 2.Qxc4#
    • 1...Sxe4
      • 2.Qc4#
    • 1...exd6
      • 2.Sd8#
  • Tries
    • 1.Sc4?
      • threat
        • 2.Sd8#
      • 1...Qf5+
        • 2.Qxf5#
      • 1...Qf7+
        • 2.Qxf7#
      • 1...Sxc4
        • 2.Qxc4#
      • 1...Qd4
        • 2.Qf5#
        • 2.Qf7#
      • 1...Qb6
        • 2.Qf5#
        • 2.Qf7#
      • 1...Sxe4!
    • 1.Sb5?
      • threat
        • 2.Sc7#
        • 2.Sd8#
      • 1...Qf5+
        • 2.Qxf5#
      • 1...Qf7+
        • 2.Qxf7#
      • 1...Qd4
        • 2.Sc7#
        • 2.Qf5#
        • 2.Qf7#
      • 1...Qc5
        • 2.Sxc5#
        • 2.Sd8#
        • 2.Qf5#
        • 2.Qf7#
      • 1...Qb6
        • 2.Qf5#
        • 2.Qf7#
      • 1...Sxe4!
    • 1.Sf5?
      • threat
        • 2.Sg7#
        • 2.Sd8#
      • 1...Qxf5+
        • 2.Qxf5#
      • 1...Qd4
        • 2.Sg7#
      • 1...Qb6
        • 2.Sg7#
      • 1...Sxe4!
    • 1.Sf7?
      • threat
        • 2.Sbd8#
        • 2.Sfd8#
      • 1...Qf5+
        • 2.Qxf5#
      • 1...Qxf7+
        • 2.Qxf7#
      • 1...Qd4
        • 2.Sg5#
        • 2.Qf5#
      • 1...Qb6
        • 2.Sg5#
        • 2.Qf5#
      • 1...Sxe4!
    • 1.Sc8?
      • threat
        • 2.Sd8#
      • 1...Qf5+
        • 2.Qxf5#
      • 1...Qf7+
        • 2.Qxf7#
      • 1...Qd4
        • 2.Qf5#
        • 2.Qf7#
      • 1...Qb6
        • 2.Qf5#
        • 2.Qf7#
      • 1...Sxe4!
    • 1.Qa6?
      • threat
        • 2.Sd8#
      • 1...Qf5+
        • 2.Sxf5#
      • 1...Qf7+
        • 2.Sxf7#
      • 1...Sxe4
        • 2.Qc4#
      • 1...Qb6!
    • 1.Qxf2?
      • threat
        • 2.Qf5#
        • 2.Qf7#
      • 1...Sxe4
        • 2.Qa2#
        • 2.Qf7#
      • 1...Sf3
        • 2.Qa2#
      • 1...gxf2!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Qd5#
      • 1...Qf5+
        • 2.exf5#
      • 1...Qf7+
        • 2.Bxf7#
      • 1...Sxe4
        • 2.Qc4#
        • 2.Qb3#
      • 1...Qd4
        • 2.Bf7#
      • 1...Qc5
        • 2.Bf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • Q(b);CHECK,OGATE::QAB1(A),XQ(b)
    • S(a);N_GUARD::QAB(A)
    • S(a);N_GUARD::QAB(A),XS(a)
    • S(a);N_GUARD,XP(B)::QAB(A)
    • P(g);SBLOCK,XS(E)::S(F)
  • Tries
    • Try
      • S(E);
      • Threat
        • S(F)
      • Vars
        • Q(b);CHECK,OGATE::QAB1(A),XQ(b)
        • S(a);OGATE,XS(E)::QAB(A),XS(a)
      • Refutation
        • S(a);XP(B)
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);CHECK,OGATE::QAB1(A),XQ(b)
      • Refutation
        • S(a);XP(B)
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);CHECK,OGATE,XS(E)::QAB1(A),XQ(b)
        • Q(b);::S(E)
      • Refutation
        • S(a);XP(B)
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);CHECK,OGATE::QAB1(A),XQ(b)
        • Q(b);CHECK,OGATE,XS(E)::QAB1(A),XQ(b)
      • Refutation
        • S(a);XP(B)
    • Try
      • S(E);
      • Threat
        • S(F)
      • Vars
        • Q(b);CHECK,OGATE::QAB1(A),XQ(b)
      • Refutation
        • S(a);XP(B)
    • Try
      • Q(A);
      • Threat
        • S(F)
      • Vars
        • Q(b);CHECK,N_GUARD::QAR(A)+S(E),XQ(b)
        • S(a);N_GUARD,XP(B)::QAB(A)
      • Refutation
        • Q(b);
    • Try
      • Q(A);XQ(b)
      • Threat
        • DUALS(2)
      • Vars
        • S(a);OGATE::QAB(A)
      • Refutation
        • P(c);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • Q(b);CHECK,OGATE::P(B),XQ(b)
      • Q(b);CHECK,N_GUARD::B(G),XQ(b)
      • Q(b);N_GUARD::B(G)
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Developed and maintained by Brian Stephenson.
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