MESON Chess Problem Database

Problem Display
PID: 157783 (4n3/3b1p2/Q4R2/q1RPk1P1/1pB5/1P2BPn1/8/b2K4 w - - 0 1)

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

The Problemist, 1977

4n3/3b1p2/Q4R2/q1RPk1P1/1pB5/1P2BPn1/8/b2K4

#2

10 + 8

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Qb6
      • 2.Qxa1#
    • 1...Qc7
      • 2.Qxa1#
    • 1...Qd8
      • 2.Qxa1#
      • 2.d6#
    • 1...Qa2
      • 2.d6#
    • 1...Qa3
      • 2.d6#
    • 1...Qa4
      • 2.d6#
    • 1...Qb5
      • 2.Qxa1#
    • 1...Qxa6
      • 2.d6#
    • 1...Bd4
      • 2.Bf4#
    • 1...Bb5
      • 2.d6#
    • 1...Se4
      • 2.f4#
    • 1...Sd6
      • 2.Qxd6#
    • 1...Sxf6
      • 2.Qxf6#
    • 1...Sc7
      • 2.Qd6#
    • 1...Sg7
      • 2.Qd6#
  • Keys
    • 1.Bb5!
      • threat
        • 2.d6#
      • 1...Qxb5
        • 2.Qxa1#
      • 1...Sxf6
        • 2.Qxf6#
      • 1...Qb6
        • 2.Qxa1#
      • 1...Qc7
        • 2.Qxa1#
      • 1...Bd4
        • 2.Bf4#
      • 1...Bc6
        • 2.dxc6#
      • 1...Be6
        • 2.dxe6#
      • 1...Se4
        • 2.f4#
      • 1...Sd6
        • 2.Qxd6#
      • 1...Sc7
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • Q(d);OGATE::QAB(I),XB(a)
    • Q(d);N_GUARD::R(F)+P(G)
    • Q(d);N_GUARD,P_PINP(B)::R(F)+P(G)
    • Q(d);N_GUARD,XQ(I)::R(F)+P(G)
    • B(a);SBLOCK::B(C)
    • B(f);S_CUTQ(d)::R(F)+P(G)
    • S(b);SBLOCK::P(D)
    • S(h);N_GUARD::QAB1(I),XS(h)
    • S(h);OGATE,XR(J)::QAB1(I),XS(h)
    • S(h);N_GUARD::QAB1(I)
  • Actual
    • B(E);
    • Threat
      • R(F)+P(G)
    • Vars
      • Q(d);OGATE,XB(E)::QAB(I),XB(a)
      • S(h);OGATE,XR(J)::QAB1(I),XS(h)
      • Q(d);OGATE::QAB(I),XB(a)
      • B(a);SBLOCK::B(C)
      • B(f);OGATE::R(F)+P(G),XB(f)
      • S(b);SBLOCK::P(D)
      • S(h);N_GUARD::QAB1(I),XS(h)
      • S(h);N_GUARD::QAB1(I)
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Developed and maintained by Brian Stephenson.
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