MESON Chess Problem Database

Problem Display
PID: 186006 (2R5/3p4/1P1ppqN1/b1Bk1p2/5p1r/2pP1PP1/P5Bp/2nQ3K w - - 0 1)

Howard, David M

Problem Observer, 2017

2R5/3p4/1P1ppqN1/b1Bk1p2/5p1r/2pP1PP1/P5Bp/2nQ3K

#2

11 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5
      • 2.Se7#
    • 1...Sxa2
      • 2.Qb3#
    • 1...Se2
      • 2.Qb3#
    • 1...Sb3
      • 2.Qxb3#
    • 1...Sxd3
      • 2.Qb3#
    • 1...fxg3
      • 2.f4#
  • Tries
    • 1.Sxf4+?
      • 1...Ke5
        • 2.d4#
      • 1...Rxf4!
    • 1.Se7+?
      • 1...Ke5
        • 2.d4#
      • 1...Qxe7!
  • Keys
    • 1.Qa4!
      • threat
        • 2.Qc4#
      • 1...Qxg6
        • 2.Qd4#
      • 1...Sxd3
        • 2.Qb3#
      • 1...fxg3
        • 2.f4#
      • 1...dxc5
        • 2.Qxd7#
      • 1...Qd4
        • 2.Qxd4#
      • 1...Bb4
        • 2.Qa8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • Q(k);N_GUARD,SBLOCK::S(J)
    • S(a);N_GUARD,XP(C)::QAB(A)
    • S(a);N_GUARD::QAB(A)
    • S(a);N_GUARD::QAB(A),XS(a)
    • S(a);N_GUARD,P_SPINS(a),XP(E)::QAB(A)
    • P(d);OGATE,XP(G)::B(D)+P(F)
  • Tries
    • Try
      • S(J);CHECK,XP(d)
      • Vars
        • K(g);P-FLIGHT::P(E)
      • Refutation
        • R(e);XS(J)
    • Try
      • S(J);CHECK
      • Vars
        • K(g);P-FLIGHT::P(E)
      • Refutation
        • Q(k);XS(J)
  • Actual
    • Q(A);
    • Threat
      • QAB1(A)
    • Vars
      • Q(k);N_GUARD,XS(J)::QAR1(A)
      • S(a);N_GUARD,XP(E)::QAB(A)
      • P(d);OGATE,XP(G)::B(D)+P(F)
      • P(i);OGATEB,XB(H)::QAR2(A),XP(l)
      • Q(k);N_GUARD::QAR1(A),XQ(k)
      • B(f);OGATE::QAB(A)
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