MESON Chess Problem Database

Problem Display
PID: 142424 (8/b6B/2K5/p2N4/N3n3/1p1r4/2kPQp2/3Rn3 w - - 0 1)

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

Ilford Recorder, 1950

8/b6B/2K5/p2N4/N3n3/1p1r4/2kPQp2/3Rn3

#2

7 + 8

14867 BCPS Library 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd2
      • 2.Qxd2#
    • 1...Rc3+
      • 2.dxc3#
    • 1...Re3
      • 2.dxe3#
    • 1...Rf3
      • 2.d4#
    • 1...Rg3
      • 2.d4#
    • 1...Rh3
      • 2.d4#
    • 1...Rd4
      • 2.Se3#
    • 1...Rxd5
      • 2.d4#
    • 1...Sxd2
      • 2.Qxd2#
    • 1...Sc3
      • 2.dxc3#
    • 1...Sc5
      • 2.Se3#
  • Tries
    • 1.Se3+?
      • 1...Rxe3
        • 2.dxe3#
      • 1...Bxe3!
  • Keys
    • 1.Ra1!
      • threat
        • 2.Qd1#
      • 1...Rc3+
        • 2.dxc3#
      • 1...Rxd2
        • 2.Qc4#
      • 1...Rxd5
        • 2.d4#
      • 1...Re3
        • 2.dxe3#
      • 1...Rf3
        • 2.d4#
      • 1...Rg3
        • 2.d4#
      • 1...Rh3
        • 2.d4#
      • 1...Rd4
        • 2.Se3#
      • 1...Sc3
        • 2.dxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • R(e);OGATE,P_SPINR(e),P_SPINS(f),XP(B)::QAR1(C),XR(e)
    • R(e);CHECK,OGATE,P_SPINS(f)::QAR(C)+P(B),XR(e)
    • R(e);OGATE,P_SPINS(f)::QAR(C)+P(B),XR(e)
    • R(e);OGATE,P_SPINS(f)::QAR(C)+P(B)
    • R(e);N_GUARD,P_SPINS(f),S_CUTB(h)::S(E)
    • R(e);OGATE,P_SPINS(f),XS(E)::QAR(C)+P(B)
    • S(f);OGATE,P_SPINR(e),P_SPINS(f),XP(B)::QAR1(C),XS(f)
    • S(f);OGATE,P_SPINR(e)::QAR(C)+P(B),XS(f)
    • S(f);P_SPINR(e),S_CUTB(h)::S(E)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • R(e);OGATE,P_SPINS(f),XS(E)::QAR(C)+P(B),XR(e)
      • Refutation
        • B(h);XS(E)
  • Actual
    • R(A);
    • Threat
      • QAB1(C)
    • Vars
      • R(e);CHECK,OGATE,P_SPINS(f)::QAR(C)+P(B),XR(e)
      • R(e);OGATE,P_SPINR(e),P_SPINS(f),SBLOCK,XP(B)::QAR2(C)
      • R(e);OGATE,P_SPINS(f),XS(E)::QAR(C)+P(B)
      • R(e);OGATE,P_SPINS(f)::QAR(C)+P(B),XR(e)
      • R(e);OGATE,P_SPINS(f)::QAR(C)+P(B)
      • R(e);N_GUARD,P_SPINS(f),S_CUTB(h)::S(E)
      • S(f);OGATE,P_SPINR(e)::QAR(C)+P(B),XS(f)
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