MESON Chess Problem Database

Problem Display
PID: 179570 (b6K/3B4/3p4/3kB3/1P1n1P2/1PpNpP1n/2PQP3/q2N2b1 w - - 0 1)

Rice, John Michael

Problem Observer, 2011

b6K/3B4/3p4/3kB3/1P1n1P2/1PpNpP1n/2PQP3/q2N2b1

#2

12 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qb1
      • 2.Sxc3#
    • 1...Qc1
      • 2.Sxc3#
    • 1...Qa2
      • 2.Sxc3#
    • 1...Qa3
      • 2.Sxc3#
    • 1...Qa4
      • 2.Sxc3#
    • 1...Qa5
      • 2.Sxc3#
    • 1...Qa6
      • 2.Sxc3#
    • 1...Qa7
      • 2.Sxc3#
    • 1...Bh2
      • 2.Sxe3#
    • 1...Sf2
      • 2.Sxe3#
    • 1...cxd2
      • 2.c4#
    • 1...exd2
      • 2.e4#
  • Tries
    • 1.Sc1?
      • threat
        • 2.Qxd4#
      • 1...cxd2
        • 2.c4#
      • 1...exd2
        • 2.e4#
      • 1...Qa7
        • 2.Sxc3#
      • 1...dxe5!
    • 1.Qxe3?
      • threat
        • 2.Qe4#
      • 1...Bxe3
        • 2.Sxe3#
      • 1...Sxf3
        • 2.Qxf3#
      • 1...dxe5
        • 2.Qxe5#
      • 1...Sf2
        • 2.Qxd4#
      • 1...Sg5!
  • Keys
    • 1.Qxc3!
      • threat
        • 2.Qc4#
      • 1...Qxc3
        • 2.Sxc3#
      • 1...Sxb3
        • 2.Qxb3#
      • 1...dxe5
        • 2.Qc5#
      • 1...Qa6
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 11
  • Sets
    • Q(a);N_GUARD::S(A),XP(c)
    • B(b);N_GUARD::S(A),XP(d)
    • S(e);S_CUTB(b)::S(A),XP(d)
    • P(c);OGATE,XQ(C)::P(B)
    • P(d);OGATE,XQ(C)::P(D)
  • Tries
    • Try
      • S(F);P_PINS(f)
      • Threat
        • QAR1(C),XS(f)
      • Vars
        • P(c);N_SPINS(f),OGATE,XQ(C)::P(B)
        • P(d);N_SPINS(f),OGATE,XQ(C)::P(D)
        • Q(a);N_GUARD::S(A),XP(c)
      • Refutation
        • P(h);XB(J)
    • Try
      • Q(C);XP(d)
      • Threat
        • QAB1(C)
      • Vars
        • B(b);XQ(C)::S(A),XB(b)
        • S(f);OGATE,XP(G)::QAB(C),XS(f)
        • P(h);OGATE,XB(J)::QAR1(C),XP(h)
        • S(e);S_CUTB(b)::QAR1(C),XS(f)
      • Refutation
        • S(e);
  • Actual
    • Q(C);XP(c)
    • Threat
      • QAB1(C)
    • Vars
      • Q(a);XQ(C)::S(A),XQ(a)
      • S(f);OGATE,XP(E)::QAB(C),XS(f)
      • P(h);N_GUARD,XB(J)::QAR1(C)
      • Q(a);N_GUARD::QAR1(C),XS(f)
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