MESON Chess Problem Database

Problem Display
PID: 133123 (8/2N3n1/8/1p2p3/1Qq1k3/1bpN4/2P1K3/5RB1 w - - 0 1)

Boyer, Jean-Pierre

Paris, 1984

8/2N3n1/8/1p2p3/1Qq1k3/1bpN4/2P1K3/5RB1

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Sc5#
  • Tries
    • 1.Sd5?
      • threat
        • 2.Sxc3#
        • 2.Sf6#
      • 1...Qxb4
        • 2.Sf6#
      • 1...Sh5
        • 2.Sxc3#
      • 1...Se8
        • 2.Sxc3#
      • 1...Kxd5!
    • 1.Qc5?
      • threat
        • 2.Qe3#
        • 2.Qxe5#
      • 1...Qxd3+
        • 2.cxd3#
      • 1...Qxc5
        • 2.Sxc5#
      • 1...Qd5
        • 2.Qe3#
      • 1...Qe6
        • 2.Qe3#
      • 1...Sf5
        • 2.Qxe5#
      • 1...Qd4!
    • 1.Qe7?
      • threat
        • 2.Rf4#
        • 2.Qh4#
        • 2.Qxe5#
      • 1...Qxd3+
        • 2.cxd3#
      • 1...Qd5
        • 2.Rf4#
        • 2.Qh4#
      • 1...Qe6
        • 2.Sc5#
      • 1...Qf7
        • 2.Sc5#
        • 2.Qxe5#
      • 1...Qd4
        • 2.Rf4#
        • 2.Qh4#
      • 1...Qc5
        • 2.Sxc5#
        • 2.Rf4#
        • 2.Qh4#
      • 1...Sf5
        • 2.Rf4#
        • 2.Qxe5#
      • 1...Sh5
        • 2.Qxe5#
        • 2.Qh7#
      • 1...Se6
        • 2.Qh7#
      • 1...Qxc7!
    • 1.Qxc4+?
      • 1...bxc4
        • 2.Sc5#
      • 1...Bxc4!
  • Keys
    • 1.Qf8!
      • threat
        • 2.Qf3#
      • 1...Qxd3+
        • 2.cxd3#
      • 1...Qf7
        • 2.Sc5#
      • 1...Sf5
        • 2.Qxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(c);N_PINS(E)::S(E)
  • Tries
    • Try
      • S(G);
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);N_PINS(E),N_SPINQ(c),XQ(F)::S(G)
        • S(g);::S(G),XP(b)
      • Refutation
        • K(d);N_SPINQ(c),S_FLIGHT,XS(G)
    • Try
      • Q(F);N_PINQ(c)
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);CHECK,OGATE,XS(E)::P(C),XQ(c)
        • Q(c);N_PINS(E),XQ(F)::S(E),XQ(c)
        • Q(c);N_PINS(E)::QAR1(F)
        • S(g);::QAR1(F),XP(f)
      • Refutation
        • Q(c);N_PINS(E)
    • Try
      • Q(F);N_PINQ(c),P_PINP(f)
      • Threat
        • DUALS(3)
      • Vars
        • Q(c);CHECK,OGATE,XS(E)::P(C),XQ(c)
        • Q(c);N_PINS(E),N_SPINP(f)::S(E)
        • S(g);N_SPINP(f),OGATE::QAB(F)
      • Refutation
        • Q(c);N_PINS(E),XS(G)
    • Try
      • Q(F);CHECK,N_SPINS(E),XQ(c)
      • Vars
        • P(e);XQ(F)::S(E)
      • Refutation
        • B(a);P_PINS(E),XQ(F)
  • Actual
    • Q(F);N_PINQ(c)
    • Threat
      • QAB1(F)
    • Vars
      • Q(c);CHECK,OGATE,XS(E)::P(C),XQ(c)
      • Q(c);N_PINS(E)::S(E)
      • S(g);N_GUARD::QAB1(F),XS(g)
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