MESON Chess Problem Database

Problem Display
PID: 108396 (8/8/6K1/5B2/3P1k2/2Q5/2P3Pn/5n2 w - - 0 1)

Harth, Arthur R

Northwest Chess, 1975

8/8/6K1/5B2/3P1k2/2Q5/2P3Pn/5n2

#2

6 + 3

5454 Near Snap 2009
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2
      • 2.g3#
    • 1...Se3
      • 2.Qc7#
    • 1...Sg3
      • 2.Qd2#
    • 1...Sf3
      • 2.Qxf3#
    • 1...Sg4
      • 2.Qf3#
  • Tries
    • 1.Kf6?
      • 1...Se3
        • 2.Qc7#
      • 1...Sf3
        • 2.Qxf3#
      • 1...Sd2
        • 2.g3#
      • 1...Sg3
        • 2.Qd2#
      • 1...Sg4+!
    • 1.Qb3?
      • 1...Se3
        • 2.Qb8#
      • 1...Sf3
        • 2.Qxf3#
      • 1...Sd2
        • 2.g3#
      • 1...Sg4
        • 2.Qf3#
      • 1...Sg3!
    • 1.Qd3?
      • 1...Sf3
        • 2.Qxf3#
      • 1...Sd2
        • 2.g3#
      • 1...Sg3
        • 2.Qd2#
      • 1...Sg4
        • 2.Qf3#
      • 1...Se3!
    • 1.Qh3?
      • 1...Sg3
        • 2.Qh6#
      • 1...Sf3
        • 2.Qxf3#
      • 1...Se3
        • 2.Qxh2#
      • 1...Sg4
        • 2.Qf3#
      • 1...Sd2!
  • Keys
    • 1.Qa3!
      • 1...Se3
        • 2.Qd6#
      • 1...Sf3
        • 2.Qxf3#
      • 1...Sd2
        • 2.g3#
      • 1...Sg3
        • 2.Qc1#
      • 1...Sg4
        • 2.Qf3#

Anticipated by 18667(1957)

This anticipates 215664(1979)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::P(B)
    • S(a);SBLOCK::QAB(C)
    • S(a);N_GUARD,SBLOCK::QAB(C)
    • S(b);N_GUARD::QAR1(C),XS(b)
    • S(b);N_GUARD::QAR1(C)
  • Tries
    • Try
      • K(F);P-FLIGHT
      • Vars
        • S(a);SBLOCK::QAB(C)
        • S(b);N_GUARD::QAR1(C),XS(b)
        • S(a);N_GUARD::P(B)
        • S(a);N_GUARD,SBLOCK::QAB(C)
      • Refutation
        • S(b);CHECK
    • Try
      • Q(C);
      • Vars
        • S(a);SBLOCK::QAB(C)
        • S(b);N_GUARD::QAR1(C),XS(b)
        • S(a);N_GUARD::P(B)
        • S(b);N_GUARD::QAR1(C)
      • Refutation
        • S(a);
    • Try
      • Q(C);
      • Vars
        • S(b);N_GUARD::QAR1(C),XS(b)
        • S(a);N_GUARD::P(B)
        • S(a);N_GUARD,SBLOCK::QAB(C)
        • S(b);N_GUARD::QAR1(C)
      • Refutation
        • S(a);
    • Try
      • Q(C);
      • Vars
        • S(a);SBLOCK::QAB(C)
        • S(b);N_GUARD::QAR1(C),XS(b)
        • S(a);N_GUARD,SBLOCK::QAB(C),XS(b)
        • S(b);N_GUARD::QAR1(C)
      • Refutation
        • S(a);
  • Actual
    • Q(C);
    • Vars
      • S(a);SBLOCK::QAB(C)
      • S(b);N_GUARD::QAR1(C),XS(b)
      • S(a);N_GUARD::P(B)
      • S(a);N_GUARD,SBLOCK::QAB(C)
      • S(b);N_GUARD::QAR1(C)
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