MESON Chess Problem Database

Problem Display
PID: 231557 (5Q2/1n1k4/4N3/3K4/8/8/8/8 w - - 0 1)

Szentgyorgy, Erno

Magyar Sakkvilag, 1927

5Q2/1n1k4/4N3/3K4/8/8/8/8

#2

3 + 2

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sa5
      • 2.Qd8#
    • 1...Sc5
      • 2.Qd8#
    • 1...Sd6
      • 2.Qd8#
    • 1...Sd8
      • 2.Qxd8#
  • Tries
    • 1.Qe7+?
      • 1...Kc8
        • 2.Qc7#
      • 1...Kxe7!
    • 1.Qg7+?
      • 1...Kc8
        • 2.Qc7#
      • 1...Ke8!
    • 1.Qa8?
      • 1...Sd8
        • 2.Qxd8#
      • 1...Sa5
        • 2.Qd8#
      • 1...Sc5
        • 2.Qd8#
      • 1...Sd6
        • 2.Qd8#
      • 1...Ke7!
    • 1.Qb8?
      • 1...Sd8
        • 2.Qxd8#
      • 1...Sa5
        • 2.Qd8#
      • 1...Sc5
        • 2.Qd8#
      • 1...Sd6
        • 2.Qd8#
      • 1...Ke7!
    • 1.Qg8?
      • 1...Sd8
        • 2.Qxd8#
      • 1...Sa5
        • 2.Qd8#
      • 1...Sc5
        • 2.Qd8#
      • 1...Sd6
        • 2.Qd8#
      • 1...Ke7!
    • 1.Qh8?
      • 1...Sd8
        • 2.Qxd8#
      • 1...Sa5
        • 2.Qd8#
      • 1...Sc5
        • 2.Qd8#
      • 1...Sd6
        • 2.Qd8#
      • 1...Ke7!
  • Keys
    • 1.Qf7+!
      • 1...Kc8
        • 2.Qc7#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • S(a);N_GUARD::QAR1(C)
    • S(a);N_GUARD::QAR1(C),XS(a)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAR1(C)
      • Refutation
        • K(b);P-FLIGHT,XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAR1(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);
      • Vars
        • S(a);N_GUARD::QAR1(C),XS(a)
        • S(a);N_GUARD::QAR1(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);
      • Vars
        • S(a);N_GUARD::QAR1(C),XS(a)
        • S(a);N_GUARD::QAR1(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);
      • Vars
        • S(a);N_GUARD::QAR1(C),XS(a)
        • S(a);N_GUARD::QAR1(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);
      • Vars
        • S(a);N_GUARD::QAR1(C),XS(a)
        • S(a);N_GUARD::QAR1(C)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(C);CHECK
    • Vars
      • K(b);OGATE,S_FLIGHT::QAR1(C)
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