MESON Chess Problem Database

Problem Display
PID: 203235 (8/3K2n1/2Q5/4k3/6P1/8/4N3/8 w - - 0 1)

Lester, William Edward

Chess Amateur (The), 1924

8/3K2n1/2Q5/4k3/6P1/8/4N3/8

#2

4 + 2

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sf5
      • 2.Qe6#
    • 1...Sh5
      • 2.Qe6#
    • 1...Se6
      • 2.Qxe6#
    • 1...Se8
      • 2.Qe6#
  • Tries
    • 1.Ke7?
      • 1...Sh5
        • 2.Qe6#
      • 1...Se6
        • 2.Qxe6#
      • 1...Se8
        • 2.Qe6#
      • 1...Sf5+!
    • 1.Qc3+?
      • 1...Kd5
        • 2.Qd4#
      • 1...Ke4!
    • 1.Qc4?
      • threat
        • 2.Qd4#
      • 1...Sf5
        • 2.Qe6#
      • 1...Se6
        • 2.Qxe6#
      • 1...Kf6!
    • 1.Qb6?
      • threat
        • 2.Qd4#
      • 1...Kd5
        • 2.Qd4#
      • 1...Se6
        • 2.Qxe6#
      • 1...Sf5
        • 2.Qe6#
      • 1...Ke4!
    • 1.Qg6?
      • 1...Sf5
        • 2.Qxf5#
        • 2.Qe6#
      • 1...Sh5
        • 2.Qf5#
        • 2.Qe6#
      • 1...Se6
        • 2.Qf5#
        • 2.Qxe6#
      • 1...Se8
        • 2.Qf5#
        • 2.Qe6#
      • 1...Kd5!
    • 1.g5?
      • 1...Sf5
        • 2.Qe6#
      • 1...Sh5
        • 2.Qe6#
      • 1...Se6
        • 2.Qxe6#
      • 1...Se8
        • 2.Qe6#
      • 1...Kf5!
  • Keys
    • 1.Qf3!
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sh5
        • 2.Qf5#
      • 1...Se6
        • 2.Qf5#
      • 1...Se8
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 4
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD::QAR1(C)
    • S(b);N_GUARD::QAR1(C),XS(b)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Vars
        • S(b);N_GUARD::QAR1(C)
        • S(b);N_GUARD::QAR1(C),XS(b)
      • Refutation
        • S(b);CHECK
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • S(b);N_GUARD::QAR1(C)
        • S(b);N_GUARD::QAR1(C),XS(b)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
        • S(b);N_GUARD::QAR1(C),XS(b)
        • S(b);N_GUARD::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • P(B);
      • Vars
        • S(b);N_GUARD::QAR1(C)
        • S(b);N_GUARD::QAR1(C),XS(b)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(C);
    • Vars
      • S(b);N_GUARD::QAR1(C),XS(b)
      • S(b);N_GUARD::QAR1(C)
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