MESON Chess Problem Database

Problem Display
PID: 221655 (8/3Q4/N7/1Nn5/k3n3/8/2P5/2KBB3 w - - 0 1)

Ouellet, Charles

The Problemist, 1987

8/3Q4/N7/1Nn5/k3n3/8/2P5/2KBB3

#2

7 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Sf2
      • 2.Sxc5#
    • 1...Sg3
      • 2.Sxc5#
    • 1...Sg5
      • 2.Sxc5#
    • 1...Sd6
      • 2.Sxc5#
    • 1...Sf6
      • 2.Sxc5#
    • 1...Sb3+
      • 2.cxb3#
    • 1...Sd3+
      • 2.cxd3#
    • 1...Sxa6
      • 2.c4#
    • 1...Se6
      • 2.c4#
    • 1...Sb7
      • 2.c4#
    • 1...Sxd7
      • 2.c4#
  • Tries
    • 1.Sc3+?
      • 1...Ka5
        • 2.Qb5#
      • 1...Ka3!
  • Keys
    • 1.Bb4!
      • threat
        • 2.Sc3#
      • 1...Sb3+
        • 2.cxb3#
      • 1...Sd3+
        • 2.cxd3#
      • 1...Sxa6
        • 2.c3#
      • 1...Sxd7
        • 2.c4#
      • 1...Sc3
        • 2.Sxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • S(b);N_GUARD::S(F),XS(c)
    • S(c);CHECK,OGATE::P(D),XS(c)
    • S(c);CHECK,OGATE::B(B)+P(D),XS(c)
    • S(c);N_GUARD,XS(F)::B(B)+P(D)
    • S(c);N_GUARD::B(B)+P(D)
    • S(c);N_GUARD,XQ(G)::B(B)+P(D)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(G)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • B(C);
    • Threat
      • QAB(G)+S(E),DCHECK
    • Vars
      • S(c);CHECK,OGATE::P(D),XS(c)
      • S(c);CHECK,OGATE::B(B)+P(D),XS(c)
      • S(c);N_GUARD,XS(F)::B(B)+P(D)
      • S(c);N_GUARD,XQ(G)::B(B)+P(D)
      • S(b);::QAB(G)+S(E),DCHECK,XS(b)
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