MESON Chess Problem Database

Problem Display
PID: 142461 (3b3K/5ppB/N1p5/p3B3/2k2P2/rR4n1/4b3/1Q6 w - - 0 1)

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

Loughton Times, 1948

(First published on Fri Nov 5 1948)

3b3K/5ppB/N1p5/p3B3/2k2P2/rR4n1/4b3/1Q6

#2

7 + 9

14867 BCPS Library 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Bd1
      • 2.Qd3#
    • 1...Bd3
      • 2.Qxd3#
    • 1...Bf3
      • 2.Qd3#
    • 1...Bg4
      • 2.Qd3#
    • 1...Bh5
      • 2.Qd3#
    • 1...f5
      • 2.Bg8#
    • 1...f6
      • 2.Bg8#
  • Tries
    • 1.Bd3+?
      • 1...Bxd3
        • 2.Qxd3#
      • 1...Kd5!
    • 1.Bg8?
      • threat
        • 2.Bxf7#
      • 1...Kd5
        • 2.Bxf7#
      • 1...Bf3
        • 2.Qd3#
      • 1...Bg4
        • 2.Qd3#
      • 1...Bh5
        • 2.Qd3#
      • 1...Rxb3!
    • 1.Qe4+?
      • 1...Kxb3
        • 2.Qc2#
      • 1...Sxe4!
    • 1.Qc1+?
      • 1...Kxb3
        • 2.Qc2#
      • 1...Kd5!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Qxf7#
      • 1...Kxb3
        • 2.Qc2#
      • 1...Kd5
        • 2.Qxf7#
      • 1...Rxb3
        • 2.Qxc6#
      • 1...fxg6
        • 2.Bg8#
      • 1...Bf3
        • 2.Qd3#
      • 1...Bg4
        • 2.Qd3#
      • 1...Bh5
        • 2.Qd3#
      • 1...f5
        • 2.Bg8#
        • 2.Qf7#
        • 2.Qe6#
      • 1...f6
        • 2.Bg8#
        • 2.Qf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • B(a);N_GUARD::QAB1(A)
    • B(a);N_GUARD::QAB1(A),XB(a)
    • P(g);OGATEB::B(F)
  • Tries
    • Try
      • B(F);CHECK
      • Vars
        • B(a);OGATE,XB(F)::QAB1(A),XB(a)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • B(F);P_PINP(g)
      • Threat
        • B(F),XP(g)
      • Vars
        • K(d);S_FLIGHT::B(F),XP(g)
        • B(a);N_GUARD::QAB1(A)
      • Refutation
        • R(b);XR(B)
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);S_FLIGHT,XR(B)::QAB1(A)
      • Refutation
        • S(c);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(d);S_FLIGHT,XR(B)::QAB1(A)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAB(A),XP(g)
    • Vars
      • K(d);S_FLIGHT,XR(B)::QAB1(A)
      • K(d);S_FLIGHT::QAB(A),XP(g)
      • R(b);SBLOCK,XR(B)::QAR2(A),XP(f)
      • P(g);OGATEB,XQ(A)::B(F)
      • B(a);N_GUARD::QAB1(A)
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