MESON Chess Problem Database

Problem Display
PID: 178705 (4Q3/3p1p2/8/8/4N2K/2p5/1pPpkPB1/1N1nb3 w - - 0 1)

Maleika, Gerhard

3rd Prize, Problem Observer Block-Threat Ty., 2009-2010

4Q3/3p1p2/8/8/4N2K/2p5/1pPpkPB1/1N1nb3

#2

7 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Bxf2+
      • 2.Sg3#
    • 1...Sxf2
      • 2.Sexc3#
    • 1...Se3
      • 2.Sbxc3#
    • 1...d5
      • 2.Qb5#
    • 1...d6
      • 2.Qb5#
    • 1...f5
      • 2.Qh5#
    • 1...f6
      • 2.Qh5#
  • Tries
    • 1.Kh3?
      • 1...Bxf2
        • 2.Sexc3#
        • 2.Sg3#
      • 1...Se3
        • 2.Sbxc3#
      • 1...d5
        • 2.Qb5#
      • 1...d6
        • 2.Qb5#
      • 1...f5
        • 2.Qh5#
      • 1...f6
        • 2.Qh5#
      • 1...Sxf2+!
    • 1.Kg5?
      • 1...Bxf2
        • 2.Sexc3#
        • 2.Sg3#
      • 1...Sxf2
        • 2.Sexc3#
      • 1...Se3
        • 2.Sbxc3#
      • 1...d5
        • 2.Qb5#
      • 1...d6
        • 2.Qb5#
      • 1...f5
        • 2.Qh5#
      • 1...f6+!
    • 1.Qxf7?
      • threat
        • 2.Sg3#
        • 2.Qc4#
        • 2.Qh5#
        • 2.Qf3#
      • 1...Sxf2
        • 2.Qf3#
      • 1...Se3
        • 2.Sbxc3#
        • 2.Sexc3#
        • 2.Qf3#
      • 1...d5
        • 2.Sg3#
        • 2.Qh5#
        • 2.Qf3#
      • 1...Bxf2+!
  • Keys
    • 1.Qe5!
      • threat
        • 2.Qb5#
        • 2.Qh5#
      • 1...Bxf2+
        • 2.Sg3#
      • 1...Sxf2
        • 2.Sexc3#
      • 1...Se3
        • 2.Sbxc3#
      • 1...d5
        • 2.Qh5#
      • 1...f5
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • B(b);CHECK,SBLOCK,XP(C)::QAR(G)+S(E),DCHECK
    • S(a);SBLOCK,XP(C)::QAR(G)+S(E),DCHECK,XP(f)
    • S(a);N_GUARD::S(A),XP(f)
    • P(g);OGATE::QAB(G)
    • P(h);OGATE::QAB(G)
  • Tries
    • Try
      • K(F);N_SPINP(C),P-FLIGHT
      • Vars
        • S(a);N_GUARD::S(A),XP(f)
        • P(g);OGATE::QAB(G)
        • P(h);OGATE::QAB(G)
      • Refutation
        • S(a);CHECK,XP(C)
    • Try
      • K(F);N_SPINP(C),S_FLIGHT
      • Vars
        • S(a);SBLOCK,XP(C)::QAR(G)+S(E),DCHECK,XP(f)
        • S(a);N_GUARD::S(A),XP(f)
        • P(g);OGATE::QAB(G)
        • P(h);OGATE::QAB(G)
      • Refutation
        • P(h);CHECK
    • Try
      • Q(G);XP(h)
      • Threat
        • DUALS(4)
      • Vars
        • S(a);XP(C)::QAB1(G)
      • Refutation
        • B(b);CHECK,XP(C)
  • Actual
    • Q(G);
    • Threat
      • DUALS(2)
    • Vars
      • B(b);CHECK,SBLOCK,XP(C)::QAR(G)+S(E),DCHECK
      • S(a);SBLOCK,XP(C)::QAR(G)+S(E),DCHECK,XP(f)
      • S(a);N_GUARD::S(A),XP(f)
      • P(g);::QAB(G)
      • P(h);::QAB(G)
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