MESON Chess Problem Database

Problem Display
PID: 180602 (Q7/3p3n/p1Ppp3/Rn1Pk1pN/1K4P1/2P2P2/1B6/7B w - - 0 1)

Howard, David M

Problem Observer, 2012

Q7/3p3n/p1Ppp3/Rn1Pk1pN/1K4P1/2P2P2/1B6/7B

#2

11 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd5
      • 2.c4#
      • 2.f4#
    • 1...Sa3
      • 2.c4#
    • 1...Sxc3
      • 2.Bxc3#
    • 1...Sd4
      • 2.cxd4#
    • 1...Sa7
      • 2.c4#
    • 1...Sc7
      • 2.c4#
    • 1...exd5
      • 2.Qe8#
  • Tries
    • 1.Rxb5?
      • threat
        • 2.c4#
      • 1...exd5
        • 2.Qe8#
      • 1...a5+!
    • 1.Qh8+?
      • 1...Kxd5
        • 2.f4#
      • 1...Sf6!
    • 1.c4+?
      • 1...Sc3
        • 2.Bxc3#
      • 1...Sd4!
  • Keys
    • 1.Qg8!
      • 1...Kxd5
        • 2.f4#
      • 1...Sxc3
        • 2.Bxc3#
      • 1...exd5
        • 2.Qe8#
      • 1...dxc6
        • 2.Qxe6#
      • 1...Sf6
        • 2.Qxg5#
      • 1...Sa3
        • 2.c4#
      • 1...Sd4
        • 2.cxd4#
      • 1...Sa7
        • 2.c4#
      • 1...Sc7
        • 2.c4#
      • 1...Sf8
        • 2.Qxg5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::B(B)+P(C)
    • S(a);OGATE,P_SPINS(a),XP(C)::B(B),XS(a)
    • S(a);OGATE::P(C),XS(a)
    • P(f);OGATEB,SBLOCK,XP(H)::QAR(K)
  • Tries
    • Try
      • R(G);XS(a)
      • Threat
        • B(B)+P(C)
      • Vars
        • P(f);OGATEB,P_SPINP(f),XP(H)::QAR(K)
      • Refutation
        • P(d);CHECK
    • Try
      • Q(K);CHECK
      • Vars
        • K(b);P-FLIGHT,P_SPINS(a),XP(H)::B(A)+P(D)
      • Refutation
        • S(h);P_SPINS(h)
    • Try
      • P(C);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::B(B),XS(a)
      • Refutation
        • S(a);P_SPINS(a)
  • Actual
    • Q(K);
    • Vars
      • K(b);P-FLIGHT,P_SPINP(f),P_SPINS(a),XP(H)::B(A)+P(D)
      • S(a);OGATE,P_SPINS(a),XP(C)::B(B),XS(a)
      • P(f);OGATEB,SBLOCK,XP(H)::QAR(K)
      • P(g);N_GUARD,XP(J)::QAR1(K),XP(f)
      • S(h);N_GUARD::QAR2(K),XP(c)
      • S(a);N_GUARD::B(B)+P(C)
      • S(a);OGATE::P(C),XS(a)
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