MESON Chess Problem Database

Problem Display
PID: 227606 (b1B5/2Nn4/2k5/K2N4/1Q6/8/8/8 w - - 0 1)

Lester, William Edward

Comm., Magyar Sakkvilag, 1926

b1B5/2Nn4/2k5/K2N4/1Q6/8/8/8

#2

5 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bb7
      • 2.Bxb7#
    • 1...Sc5
      • 2.Qb6#
    • 1...Se5
      • 2.Qb6#
    • 1...Sb6
      • 2.Qxb6#
    • 1...Sf6
      • 2.Qb6#
    • 1...Sb8
      • 2.Qb6#
    • 1...Sf8
      • 2.Qb6#
  • Tries
    • 1.Ka4?
      • 1...Sb6+
        • 2.Qxb6#
      • 1...Bb7
        • 2.Bxb7#
      • 1...Se5
        • 2.Qb6#
      • 1...Sf6
        • 2.Qb6#
      • 1...Sb8
        • 2.Qb6#
      • 1...Sf8
        • 2.Qb6#
      • 1...Sc5+!
    • 1.Sb5?
      • threat
        • 2.Se7#
        • 2.Qd6#
      • 1...Sc5
        • 2.Se7#
      • 1...Kxd5!
    • 1.Sa6?
      • threat
        • 2.Se7#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Kxd5!
    • 1.Se6?
      • threat
        • 2.Se7#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Kxd5!
    • 1.Se8?
      • threat
        • 2.Se7#
        • 2.Qd6#
        • 2.Qb5#
      • 1...Sc5
        • 2.Se7#
      • 1...Kxd5!
  • Keys
    • 1.Qe7!
      • 1...Bb7
        • 2.Bxd7#
      • 1...Sc5
        • 2.Sb4#
      • 1...Se5
        • 2.Sb4#
      • 1...Sb6
        • 2.Sb4#
      • 1...Sf6
        • 2.Sb4#
      • 1...Sb8
        • 2.Sb4#
      • 1...Sf8
        • 2.Sb4#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 7
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • B(c);N_GUARD::B(E),XB(c)
    • S(b);N_GUARD::QAR1(A)
    • S(b);N_GUARD::QAR1(A),XS(b)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • S(b);CHECK,N_GUARD::QAR1(A),XS(b)
        • B(c);N_GUARD::B(E),XB(c)
        • S(b);N_GUARD::QAR1(A)
      • Refutation
        • S(b);CHECK
    • Try
      • S(D);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);::S(C)
      • Refutation
        • K(a);S_FLIGHT,XS(C)
    • Try
      • S(D);
      • Threat
        • S(C)
      • Vars
        • S(b);N_GUARD::QAR1(A),XS(b)
      • Refutation
        • K(a);S_FLIGHT,XS(C)
    • Try
      • S(D);
      • Threat
        • S(C)
      • Vars
        • S(b);N_GUARD::QAR1(A),XS(b)
      • Refutation
        • K(a);S_FLIGHT,XS(C)
    • Try
      • S(D);
      • Threat
        • DUALS(3)
      • Vars
        • S(b);::S(C)
      • Refutation
        • K(a);S_FLIGHT,XS(C)
  • Actual
    • Q(A);
    • Vars
      • B(c);SBLOCK::B(E),XS(b)
      • S(b);::S(C)
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