MESON Chess Problem Database

Problem Display
PID: 184738 (8/1Q6/8/5N2/2p5/3k4/8/3K2n1 w - - 0 1)

Decker, Adolfph L

La Strategie, 1908

8/1Q6/8/5N2/2p5/3k4/8/3K2n1

#2

3 + 3

5454 Near Snap 2018
6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Se2
      • 2.Qf3#
    • 1...Sf3
      • 2.Qxf3#
    • 1...Sh3
      • 2.Qf3#
    • 1...c3
      • 2.Qd5#
  • Tries
    • 1.Qh1?
      • 1...Sf3
        • 2.Qxf3#
      • 1...Se2
        • 2.Qf3#
      • 1...Sh3
        • 2.Qf3#
      • 1...c3
        • 2.Qd5#
      • 1...Kc3!
    • 1.Qg2?
      • threat
        • 2.Qc2#
      • 1...Se2
        • 2.Qf3#
      • 1...c3
        • 2.Qd5#
      • 1...Kc3!
    • 1.Qc6?
      • 1...Se2
        • 2.Qf3#
      • 1...Sf3
        • 2.Qxf3#
      • 1...Sh3
        • 2.Qf3#
      • 1...c3
        • 2.Qd5#
      • 1...Kc3!
    • 1.Qa7?
      • threat
        • 2.Qe3#
        • 2.Qd4#
      • 1...Kc3
        • 2.Qa3#
      • 1...Se2
        • 2.Qe3#
      • 1...Sf3
        • 2.Qe3#
      • 1...c3
        • 2.Qd4#
      • 1...Ke4!
    • 1.Qe7?
      • threat
        • 2.Qe3#
      • 1...Kc3
        • 2.Qa3#
      • 1...c3!
  • Keys
    • 1.Qa8!
      • 1...Kc3
        • 2.Qa3#
      • 1...Se2
        • 2.Qf3#
      • 1...Sf3
        • 2.Qxf3#
      • 1...Sh3
        • 2.Qf3#
      • 1...c3
        • 2.Qd5#

Anticipated by 4716(1888)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAR2(C)
    • S(a);N_GUARD::QAR2(C),XS(a)
    • P(c);SBLOCK::QAR2(C)
  • Tries
    • Try
      • Q(C);
      • Vars
        • S(a);N_GUARD::QAR2(C),XS(a)
        • S(a);N_GUARD::QAR2(C)
        • P(c);SBLOCK::QAR2(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • S(a);N_GUARD::QAR2(C)
        • P(c);SBLOCK::QAR2(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);
      • Vars
        • S(a);N_GUARD::QAR2(C)
        • S(a);N_GUARD::QAR2(C),XS(a)
        • P(c);SBLOCK::QAR2(C)
      • Refutation
        • K(b);P-FLIGHT,P_SPINP(c)
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT::QAR2(C)
        • S(a);::QAR1(C)
        • P(c);::QAR1(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • K(b);P-FLIGHT::QAR2(C)
      • Refutation
        • P(c);
  • Actual
    • Q(C);
    • Vars
      • K(b);P-FLIGHT::QAR2(C)
      • S(a);N_GUARD::QAR2(C)
      • S(a);N_GUARD::QAR2(C),XS(a)
      • P(c);SBLOCK::QAR2(C)
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