MESON Chess Problem Database

Problem Display
PID: 182577 (3K4/2p2p2/5R2/2B1kP1n/2P1N2p/3B1P1N/3pP3/3nQ3 w - - 0 1)

Howard, David M

Problem Observer, 2015

3K4/2p2p2/5R2/2B1kP1n/2P1N2p/3B1P1N/3pP3/3nQ3

#2

11 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Sf2
      • 2.Qa1#
    • 1...Se3
      • 2.Qa1#
    • 1...Sg3
      • 2.f4#
    • 1...Sg7
      • 2.f4#
  • Tries
    • 1.Re6+?
      • 1...Kxf5
        • 2.Seg5#
      • 1...fxe6!
    • 1.Qxd2?
      • 1...Sxf6
        • 2.Qf4#
      • 1...Sb2
        • 2.Qc3#
        • 2.Qxb2#
      • 1...Sf2
        • 2.Qc3#
        • 2.Qb2#
      • 1...Sc3
        • 2.Qxc3#
      • 1...Se3
        • 2.Qc3#
        • 2.Qb2#
      • 1...Sg3
        • 2.Qf4#
        • 2.f4#
      • 1...Sf4
        • 2.Qxf4#
      • 1...Sg7
        • 2.Qf4#
        • 2.f4#
      • 1...c6!
    • 1.Qg3+?
      • 1...Sxg3
        • 2.f4#
      • 1...Sf4
        • 2.Qxf4#
      • 1...hxg3!
    • 1.Qg1?
      • threat
        • 2.Bd4#
        • 2.Qd4#
      • 1...Sf2
        • 2.Qa1#
      • 1...Se3
        • 2.Qa1#
      • 1...Sxf6!
    • 1.e3?
      • threat
        • 2.Bd4#
      • 1...Sxe3
        • 2.Qa1#
      • 1...Sxf6!
  • Keys
    • 1.Sef2!
      • threat
        • 2.Sg4#
      • 1...Kxf6
        • 2.Bd4#
      • 1...Sxf2
        • 2.Qa1#
      • 1...Sxf6
        • 2.f4#
      • 1...Se3
        • 2.Qa1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • S(a);OGATE::QAB(A)
    • S(e);N_GUARD::P(D)
  • Tries
    • Try
      • R(J);CHECK
      • Vars
        • K(d);P-FLIGHT,XP(I)::B(C)+S(G)
      • Refutation
        • P(g);XR(J)
    • Try
      • Q(A);XP(b)
      • Vars
        • S(e);N_GUARD,XR(J)::QAB1(A)
        • S(a);N_GUARD::QAB(A),XS(a)
        • S(e);N_GUARD::QAB1(A),XS(e)
      • Refutation
        • P(f);
    • Try
      • Q(A);CHECK
      • Vars
        • S(e);N_GUARD,XQ(A)::P(D)
        • S(e);N_GUARD,P_SPINS(e)::QAB1(A),XS(e)
      • Refutation
        • P(c);XQ(A)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);OGATE::QAB(A)
      • Refutation
        • S(e);XR(J)
    • Try
      • P(B);
      • Threat
        • B(H)
      • Vars
        • S(a);OGATE,XP(B)::QAB(A)
      • Refutation
        • S(e);XR(J)
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • K(d);S_FLIGHT,XR(J)::B(H)
      • S(a);OGATE,XS(G)::QAB(A)
      • S(e);N_GUARD,SBLOCK,XR(J)::P(D)
      • S(a);OGATE::QAB(A)
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