MESON Chess Problem Database

Problem Display
PID: 174927 (5NK1/8/6N1/5pk1/8/8/4Q2P/8 w - - 0 1)

Decker, Adolfph L

L'Eco degli Scacchi, 1901

5NK1/8/6N1/5pk1/8/8/4Q2P/8

#2

5 + 2

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kf6
      • 2.Qe7#
  • Tries
    • 1.Kh7?
      • 1...Kf6
        • 2.Qe7#
      • 1...f4!
    • 1.Qc4?
      • threat
        • 2.Qh4#
      • 1...Kh5
        • 2.Qh4#
      • 1...Kf6
        • 2.Qh4#
      • 1...Kh6
        • 2.Qh4#
      • 1...f4!
    • 1.Qh5+?
      • 1...Kf6
        • 2.Qh4#
      • 1...Kxh5!
    • 1.Qe7+?
      • 1...Kh5
        • 2.Qh4#
      • 1...Kh6
        • 2.Qh4#
      • 1...Kg4!
    • 1.h4+?
      • 1...Kf6
        • 2.Qa6#
        • 2.Qb2#
        • 2.Qe5#
        • 2.Qe6#
        • 2.Qe7#
      • 1...Kh6!
  • Keys
    • 1.Sf4!
      • 1...Kxf4
        • 2.Se6#
      • 1...Kh4
        • 2.Qh5#
      • 1...Kf6
        • 2.Sh7#
      • 1...Kh6
        • 2.Qh5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::QAB1(A)
  • Tries
    • Try
      • K(E);S_FLIGHT
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • K(b);P-FLIGHT::QAR1(A)
        • K(b);S_FLIGHT::QAB(A)
        • K(b);S_FLIGHT::QAR2(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB(A)
      • Refutation
        • K(b);P-FLIGHT,XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);OGATE,P-FLIGHT::QAR1(A)
        • K(b);OGATE,S_FLIGHT::QAR2(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • P(B);CHECK
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • S(C);
    • Vars
      • K(b);S_FLIGHT,XS(C)::S(D)
      • K(b);S_FLIGHT::QAR1(A)
      • K(b);S_FLIGHT::S(D)
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