MESON Chess Problem Database

Problem Display
PID: 102994 (8/1pQ2p2/1P3K2/nN1kP3/3P4/1n3P2/8/8 w - - 0 1)

Hermanson, Halvar

Source?, 1959

8/1pQ2p2/1P3K2/nN1kP3/3P4/1n3P2/8/8

#2

7 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sa1
      • 2.Qc5#
    • 1...Sc1
      • 2.Qc5#
    • 1...Sd2
      • 2.Qc5#
    • 1...Sxd4
      • 2.Sc3#
    • 1...Sc5
      • 2.Qxc5#
    • 1...Sc4
      • 2.Qxb7#
    • 1...Sc6
      • 2.Qxf7#
  • Tries
    • 1.Kxf7?
      • 1...Sxd4
        • 2.Sc3#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Sa1
        • 2.Qc5#
      • 1...Sc1
        • 2.Qc5#
      • 1...Sd2
        • 2.Qc5#
      • 1...Sc4
        • 2.Qxb7#
      • 1...Sc6!
    • 1.Sa3?
      • threat
        • 2.Qd6#
        • 2.Qd7#
      • 1...Sxd4
        • 2.Qd6#
      • 1...Sc5
        • 2.Qd6#
        • 2.Qxc5#
      • 1...Sc4
        • 2.Qxc4#
      • 1...Kxd4!
    • 1.Qd8+?
      • 1...Kc6
        • 2.Sa7#
      • 1...Kc4!
    • 1.Qc3?
      • threat
        • 2.Sc7#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Sc4!
    • 1.Qc8?
      • 1...Sxd4
        • 2.Sc3#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Sa1
        • 2.Qc5#
      • 1...Sc1
        • 2.Qc5#
      • 1...Sd2
        • 2.Qc5#
      • 1...Sc4
        • 2.Qxb7#
      • 1...Sc6!
  • Keys
    • 1.Qc2!
      • 1...Sxd4
        • 2.Sc7#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Sc4
        • 2.Qe4#
      • 1...Sa1
        • 2.Qc5#
      • 1...Sc1
        • 2.Qc5#
      • 1...Sd2
        • 2.Qc5#
      • 1...Sc6
        • 2.Qxb3#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAR1(G)
    • S(a);SBLOCK,XP(B)::S(C)
    • S(a);N_GUARD::QAR1(G),XS(a)
    • S(b);N_GUARD,SBLOCK::QAB(G),XP(d)
    • S(b);SBLOCK::QAB(G),XP(e)
  • Tries
    • Try
      • K(F);P-FLIGHT,XP(e)
      • Vars
        • S(a);SBLOCK,XP(B)::S(C)
        • S(a);N_GUARD::QAR1(G),XS(a)
        • S(a);N_GUARD::QAR1(G)
        • S(b);N_GUARD,SBLOCK::QAB(G),XP(d)
      • Refutation
        • S(b);
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);SBLOCK,XP(B)::QAR1(G)
        • S(b);N_GUARD::QAB1(G),XS(b)
      • Refutation
        • K(c);P-FLIGHT,XP(B)
    • Try
      • Q(G);CHECK
      • Vars
        • K(c);S_FLIGHT::S(C)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(G);
      • Threat
        • S(C)
      • Vars
        • S(a);N_GUARD::QAR1(G),XS(a)
      • Refutation
        • S(b);
    • Try
      • Q(G);
      • Vars
        • S(a);SBLOCK,XP(B)::S(C)
        • S(a);N_GUARD::QAR1(G),XS(a)
        • S(a);N_GUARD::QAR1(G)
        • S(b);N_GUARD,SBLOCK::QAB(G),XP(d)
      • Refutation
        • S(b);
  • Actual
    • Q(G);
    • Vars
      • S(a);SBLOCK,XP(B)::S(C)
      • S(a);N_GUARD::QAR1(G),XS(a)
      • S(b);SBLOCK::QAB1(G)
      • S(a);N_GUARD::QAR1(G)
      • S(b);N_GUARD,SBLOCK::QAB(G),XS(a)
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