MESON Chess Problem Database

Problem Display
PID: 203502 (4Bk2/8/3n2Q1/6BK/8/8/8/8 w - - 0 1)

Fredriksson, W

Folket, 1924

4Bk2/8/3n2Q1/6BK/8/8/8/8

#2

4 + 2

5454 Near Snap 2020
6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sc4
      • 2.Qf7#
    • 1...Se4
      • 2.Qf7#
    • 1...Sb5
      • 2.Qf7#
    • 1...Sf5
      • 2.Qf7#
    • 1...Sb7
      • 2.Qf7#
    • 1...Sf7
      • 2.Qxf7#
    • 1...Sc8
      • 2.Qf7#
  • Tries
    • 1.Kg4?
      • 1...Sf7
        • 2.Qxf7#
      • 1...Sc4
        • 2.Qf7#
      • 1...Se4
        • 2.Qf7#
      • 1...Sb5
        • 2.Qf7#
      • 1...Sf5
        • 2.Qf7#
      • 1...Sb7
        • 2.Qf7#
      • 1...Sc8
        • 2.Qf7#
      • 1...Sxe8!
    • 1.Bh4?
      • 1...Sf7
        • 2.Qxf7#
      • 1...Sc4
        • 2.Qf7#
      • 1...Se4
        • 2.Qf7#
      • 1...Sb5
        • 2.Qf7#
      • 1...Sf5
        • 2.Qf7#
      • 1...Sb7
        • 2.Qf7#
      • 1...Sc8
        • 2.Qf7#
      • 1...Sxe8!
    • 1.Bf6?
      • 1...Sf7
        • 2.Qxf7#
      • 1...Sc4
        • 2.Qf7#
      • 1...Se4
        • 2.Qf7#
      • 1...Sb5
        • 2.Qf7#
      • 1...Sf5
        • 2.Qf7#
      • 1...Sb7
        • 2.Qf7#
      • 1...Sc8
        • 2.Qf7#
      • 1...Sxe8!
    • 1.Bd8?
      • 1...Sf7
        • 2.Qxf7#
      • 1...Sc4
        • 2.Qf7#
      • 1...Se4
        • 2.Qf7#
      • 1...Sb5
        • 2.Qf7#
      • 1...Sf5
        • 2.Qf7#
      • 1...Sb7
        • 2.Qf7#
      • 1...Sc8
        • 2.Qf7#
      • 1...Sxe8!
    • 1.Qf6+?
      • 1...Kxe8
        • 2.Qe7#
      • 1...Sf7
        • 2.Qxf7#
      • 1...Kg8!
    • 1.Qg7+?
      • 1...Kxe8
        • 2.Qe7#
      • 1...Kxg7!
  • Keys
    • 1.Qh7!
      • threat
        • 2.Qh8#
      • 1...Kxe8
        • 2.Qe7#
      • 1...Sxe8
        • 2.Be7#
      • 1...Sf7
        • 2.Qxf7#

This anticipates 157645(2015)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • S(a);N_GUARD::QAR1(C)
    • S(a);N_GUARD::QAR1(C),XS(a)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Vars
        • S(a);N_GUARD::QAR1(C),XS(a)
        • S(a);N_GUARD::QAR1(C)
      • Refutation
        • S(a);XB(D)
    • Try
      • B(A);
      • Vars
        • S(a);N_GUARD::QAR1(C),XS(a)
        • S(a);N_GUARD::QAR1(C)
      • Refutation
        • S(a);XB(D)
    • Try
      • B(A);
      • Vars
        • S(a);N_GUARD::QAR1(C),XS(a)
        • S(a);N_GUARD::QAR1(C)
      • Refutation
        • S(a);XB(D)
    • Try
      • B(A);
      • Vars
        • S(a);N_GUARD::QAR1(C),XS(a)
        • S(a);N_GUARD::QAR1(C)
      • Refutation
        • S(a);XB(D)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT,XB(D)::QAR1(C)
        • S(a);N_GUARD,P_SPINS(a)::QAR1(C),XS(a)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT,XB(D)::QAR1(C)
      • Refutation
        • K(b);S_FLIGHT,XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAR2(C)
    • Vars
      • K(b);P-FLIGHT,XB(D)::QAR1(C)
      • S(a);SBLOCK,XB(D)::B(A)
      • S(a);N_GUARD::QAR1(C),XS(a)
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