MESON Chess Problem Database

Problem Display
PID: 33182 (8/2n5/1p6/k7/1N6/NK6/8/Q7 w - - 0 1)

Martin, Godefroy Jose

Springaren, 1952

8/2n5/1p6/k7/1N6/NK6/8/Q7

#2

4 + 3

3713 Snap 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Sb5
      • 2.Sc4#
    • 1...Sa6
      • 2.Sc6#
    • 1...b5
      • 2.Sc4#
  • Tries
    • 1.Kc4?
      • threat
        • 2.Sb1#
        • 2.Sac2#
        • 2.Sb5#
      • 1...Ka4
        • 2.Sb1#
        • 2.Sac2#
        • 2.Sb5#
      • 1...Sb5
        • 2.Sxb5#
      • 1...b5+!
    • 1.Qe5+?
      • 1...Sb5
        • 2.Sc4#
        • 2.Qxb5#
      • 1...b5
        • 2.Sc4#
        • 2.Qxc7#
      • 1...Sd5!
    • 1.Qf1?
      • threat
        • 2.Sc6#
      • 1...Sb5
        • 2.Sc4#
        • 2.Qxb5#
      • 1...b5!
  • Keys
    • 1.Qg7!
      • 1...b5
        • 2.Qxc7#
      • 1...Sd5
        • 2.Qa7#
      • 1...Sb5
        • 2.Sc4#
      • 1...Sa6
        • 2.Sc6#
      • 1...Se6
        • 2.Qa7#
      • 1...Sa8
        • 2.Qa7#
      • 1...Se8
        • 2.Qa7#

Anticipated by 17686(1948)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(c);SBLOCK::QAR(A)+S(B),DCHECK
    • S(c);SBLOCK::S(D)
    • P(b);SBLOCK::QAR(A)+S(B),DCHECK
  • Tries
    • Try
      • K(C);S_FLIGHT
      • Threat
        • DUALS(3)
      • Vars
        • S(c);::QAR(A)+S(B),XS(c)
      • Refutation
        • P(b);CHECK
    • Try
      • Q(A);CHECK
      • Refutation
        • S(c);P_SPINS(c)
    • Try
      • Q(A);
      • Threat
        • S(D)
      • Refutation
        • P(b);
  • Actual
    • Q(A);
    • Vars
      • P(b);OGATEB::QAB(A),XS(c)
      • S(c);OGATE::QAR2(A)
      • S(c);SBLOCK::S(B)
      • S(c);SBLOCK::S(D)
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