MESON Chess Problem Database

Problem Display
PID: 274419 (3Kn3/5p2/N3kp2/2Q2n2/8/5N2/8/8 w - - 0 1)

Becker, Chris

diagrammes, 1979

3Kn3/5p2/N3kp2/2Q2n2/8/5N2/8/8

#2

4 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Se3
      • 2.Sd4#
    • 1...Sg3
      • 2.Sd4#
    • 1...Sd4
      • 2.Sxd4#
    • 1...Sh4
      • 2.Sd4#
    • 1...Sfd6
      • 2.Sd4#
    • 1...Sh6
      • 2.Sd4#
    • 1...Se7
      • 2.Sd4#
    • 1...Sfg7
      • 2.Sd4#
    • 1...Sed6
      • 2.Sc7#
    • 1...Sc7
      • 2.Sxc7#
    • 1...Seg7
      • 2.Sc7#
  • Tries
    • 1.Sb4?
      • threat
        • 2.Qd5#
      • 1...Se3
        • 2.Sd4#
      • 1...Se7
        • 2.Sd4#
      • 1...Sc7!
    • 1.Qxf5+?
      • 1...Kd6
        • 2.Qd7#
      • 1...Kxf5!
    • 1.Qc6+?
      • 1...Sed6
        • 2.Sc5#
        • 2.Sc7#
      • 1...Sfd6!
    • 1.Qc8+?
      • 1...Kd6
        • 2.Qd7#
      • 1...Kd5!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Qd7#
      • 1...Kd6
        • 2.Qd7#
      • 1...Sfd6
        • 2.Sd4#
      • 1...Sed6
        • 2.Sc7#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 9
  • Sets
    • S(a);N_GUARD::S(A)
    • S(a);N_GUARD::S(A),XS(a)
    • S(e);N_GUARD::S(C)
    • S(e);N_GUARD::S(C),XS(e)
  • Tries
    • Try
      • S(C);
      • Threat
        • QAB1(B)
      • Vars
        • S(a);N_GUARD::S(A)
      • Refutation
        • S(e);
    • Try
      • Q(B);CHECK,XS(a)
      • Vars
        • K(b);OGATE,P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);S_FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • K(b);P-FLIGHT::QAR1(B)
      • S(a);N_GUARD,SBLOCK::S(A)
      • S(e);N_GUARD,SBLOCK::S(C)
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