MESON Chess Problem Database

Problem Display
PID: 11997 (5BN1/R4npQ/3Pk3/3p3p/p4P2/r7/2p4K/b4B2 w - - 0 1)

Melvin, Herbert A ('Hamel' or Zaak, HA)

The Problemist, 1973

5BN1/R4npQ/3Pk3/3p3p/p4P2/r7/2p4K/b4B2

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.Bh3#
    • 1...Rc3
      • 2.Qg6#
    • 1...Rh3+
      • 2.Bxh3#
    • 1...Bc3
      • 2.Bh3#
    • 1...Se5
      • 2.f5#
    • 1...Sxd6
      • 2.Re7#
    • 1...d4
      • 2.Bc4#
    • 1...g5
      • 2.Qxf7#
    • 1...g6
      • 2.Qxf7#
  • Tries
    • 1.Qxh5?
      • threat
        • 2.Qg4#
        • 2.Qxf7#
      • 1...Rh3+
        • 2.Bxh3#
        • 2.Qxh3#
      • 1...Sxd6
        • 2.Re7#
      • 1...Sg5
        • 2.Qg4#
      • 1...Rg3
        • 2.Qxf7#
      • 1...Bf6
        • 2.Qg4#
      • 1...Se5
        • 2.f5#
      • 1...Sd8
        • 2.Qg4#
      • 1...Sh8
        • 2.Qg4#
      • 1...d4
        • 2.Bc4#
        • 2.Qxf7#
      • 1...g6
        • 2.Qg4#
      • 1...Sh6!
  • Keys
    • 1.Qxc2!
      • threat
        • 2.Qc8#
      • 1...Rh3+
        • 2.Bxh3#
      • 1...Sxd6
        • 2.Re7#
      • 1...d4
        • 2.Bc4#
      • 1...Ra2
        • 2.Bh3#
      • 1...Rc3
        • 2.Qg6#
      • 1...Bc3
        • 2.Bh3#
      • 1...Se5
        • 2.f5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • R(c);N_GUARD::B(A)
    • R(c);S_CUTB(a)::QAR2(F)
    • R(c);CHECK,N_GUARD::B(A),XR(c)
    • B(a);S_CUTR(c)::B(A)
    • S(h);SBLOCK::P(C)
    • S(h);SBLOCK,XP(D)::R1(E)
    • P(e);OGATEB::B(A)
    • P(i);OGATE::QAB1(F),XS(h)
  • Tries
    • Try
      • Q(F);XP(f)
      • Threat
        • DUALS(2)
      • Vars
        • S(h);SBLOCK,XP(D)::R1(E)
        • S(h);::QAB(F)
        • R(c);::QAB1(F),XS(h)
        • B(a);::QAB(F)
        • S(h);SBLOCK::P(C)
        • P(i);::QAB(F)
      • Refutation
        • S(h);
  • Actual
    • Q(F);XP(b)
    • Threat
      • QAB(F)
    • Vars
      • R(c);CHECK,N_GUARD::B(A),XR(c)
      • S(h);SBLOCK,XP(D)::R1(E)
      • P(e);OGATEB::B(A)
      • R(c);N_GUARD,P_PINQ(F)::B(A)
      • R(c);S_CUTB(a)::QAR2(F)
      • B(a);S_CUTR(c)::B(A)
      • S(h);SBLOCK::P(C)
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