MESON Chess Problem Database

Problem Display
PID: 216260 (4q3/8/1Q6/8/P1kNbR2/3R4/8/5K2 w - - 0 1)

Elms, Alfred Hasting

Australasian (The), 1881

4q3/8/1Q6/8/P1kNbR2/3R4/8/5K2

#2

6 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qb5
      • 2.Qxb5#
    • 1...Qg6
      • 2.Qb5#
    • 1...Qf7
      • 2.Qb5#
    • 1...Qe6
      • 2.Qb5#
    • 1...Qe7
      • 2.Qb5#
    • 1...Qa8
      • 2.Qb5#
    • 1...Qc8
      • 2.Qb5#
    • 1...Qd8
      • 2.Qb5#
    • 1...Qf8
      • 2.Qb5#
    • 1...Qg8
      • 2.Qb5#
    • 1...Qh8
      • 2.Qb5#
  • Tries
    • 1.Sc6?
      • threat
        • 2.Qd4#
        • 2.Qb5#
      • 1...Qxc6
        • 2.Qd4#
      • 1...Qh5
        • 2.Qd4#
      • 1...Qd7
        • 2.Se5#
        • 2.Qb5#
      • 1...Qe5
        • 2.Sxe5#
      • 1...Qb8
        • 2.Qd4#
      • 1...Qd8
        • 2.Se5#
        • 2.Qb5#
      • 1...Qh8
        • 2.Qb5#
      • 1...Kxd3!
    • 1.Rc3+?
      • 1...Kd5
        • 2.Qc5#
      • 1...Kxc3!
  • Keys
    • 1.Sf3!
      • threat
        • 2.Qd4#
      • 1...Kxd3
        • 2.Qb3#
      • 1...Qxa4
        • 2.Se5#
      • 1...Qd7
        • 2.Se5#
      • 1...Qe5
        • 2.Sxe5#
      • 1...Qd8
        • 2.Se5#
        • 2.Qb5#
      • 1...Qh8
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 10
  • Sets
    • Q(c);N_GUARD::QAB1(F),XQ(c)
    • Q(c);N_GUARD::QAB1(F)
    • Q(c);N_GUARD,P_PINR(E)::QAB1(F)
  • Tries
    • Try
      • S(D);P_PINB(b)
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);XS(D)::QAR1(F)
        • Q(c);::QAR1(F)
        • Q(c);N_GUARD::S(D),XQ(c)
        • Q(c);::QAB1(F)
      • Refutation
        • K(a);N_SPINB(b),S_FLIGHT,XR(B)
    • Try
      • R(B);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR1(F)
      • Refutation
        • K(a);P-FLIGHT,XR(B)
  • Actual
    • S(D);P_PINB(b)
    • Threat
      • QAR1(F)
    • Vars
      • K(a);N_SPINB(b),S_FLIGHT,XR(B)::QAR2(F)
      • Q(c);N_GUARD,XP(C)::S(D)
      • Q(c);N_GUARD::S(D)
      • Q(c);N_GUARD::S(D),XQ(c)
      • Q(c);N_GUARD::QAB1(F)
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