MESON Chess Problem Database

Problem Display
PID: 195055 (8/3pp3/8/2pk4/1pN5/3B2Q1/4K3/8 w - - 0 1)

Janet, Frank

Pittsburgh Gazette-Times, 1918

8/3pp3/8/2pk4/1pN5/3B2Q1/4K3/8

#2

4 + 5

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Qe5#
    • 1...e6
      • 2.Qd6#
  • Tries
    • 1.Qf3+?
      • 1...Ke6
        • 2.Qf5#
      • 1...Kd4!
    • 1.Qg4?
      • threat
        • 2.Qxd7#
        • 2.Qe4#
      • 1...d6
        • 2.Qe4#
      • 1...e5
        • 2.Qxd7#
      • 1...e6
        • 2.Qe4#
      • 1...Kc6!
    • 1.Qg6?
      • threat
        • 2.Qe4#
      • 1...e5
        • 2.Qd6#
      • 1...Kd4!
  • Keys
    • 1.Be4+!
      • 1...Kxc4
        • 2.Qd3#
      • 1...Kd4
        • 2.Qd3#
      • 1...Kxe4
        • 2.Qe5#
      • 1...Ke6
        • 2.Qg6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • K(c);P-FLIGHT::QAB1(C)
    • P(e);N_GUARD::QAR1(C)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);S_FLIGHT::QAB1(C)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • P(d);::QAB1(C)
        • P(e);::QAR2(C),XP(d)
        • P(e);::QAB1(C)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • P(e);N_GUARD::QAR1(C)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • B(B);CHECK
    • Vars
      • K(c);S_FLIGHT,XS(D)::QAB1(C)
      • K(c);P-FLIGHT::QAR1(C)
      • K(c);S_FLIGHT,XB(B)::QAR1(C)
      • K(c);S_FLIGHT::QAR2(C)
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