MESON Chess Problem Database

Problem Display
PID: 142466 (5r1r/1b1pp1BB/2R2q2/2p5/8/8/4Q1P1/k3K2R w K - 0 1)

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

The Problemist, 1949

5r1r/1b1pp1BB/2R2q2/2p5/8/8/4Q1P1/k3K2R

#2

7 + 8

14867 BCPS Library 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Qxb2#
    • 1...Qc3+
      • 2.Bxc3#
    • 1...Qe5
      • 2.Bxe5#
    • 1...Ba6
      • 2.Rxa6#
    • 1...Ba8
      • 2.Ra6#
  • Tries
    • 1.Bxf6+?
      • 1...exf6
        • 2.Kf2#
        • 2.0-0#
      • 1...e5
        • 2.Kf2#
        • 2.Bxe5#
        • 2.0-0#
      • 1...Rxf6!
    • 1.Rxc5?
      • threat
        • 2.Rc1#
        • 2.Ra5#
      • 1...Qc3+
        • 2.Bxc3#
      • 1...Rxh7
        • 2.Rc1#
      • 1...Qb2
        • 2.Ra5#
        • 2.Qxb2#
      • 1...Ra8
        • 2.Rc1#
      • 1...Rc8
        • 2.Ra5#
      • 1...Bd5
        • 2.Rc1#
      • 1...Bc6
        • 2.Rc1#
      • 1...Be4!
    • 1.Rb6?
      • threat
        • 2.Rb1#
      • 1...Qc3+
        • 2.Bxc3#
      • 1...Qb2
        • 2.Qxb2#
      • 1...Be4
        • 2.Qa6#
      • 1...Rxh7!
    • 1.Qc2?
      • threat
        • 2.Kd2#
        • 2.Ke2#
        • 2.Qb1#
      • 1...Qc3+
        • 2.Bxc3#
      • 1...Qe5+
        • 2.Bxe5#
      • 1...Qxg7
        • 2.Qb1#
      • 1...Qb2
        • 2.Qb1#
        • 2.Qa4#
        • 2.Qxb2#
      • 1...Qd4
        • 2.Qb1#
      • 1...Ba6
        • 2.Rxa6#
        • 2.Qb1#
      • 1...e5
        • 2.Qb1#
      • 1...Rxh7!
  • Keys
    • 1.Qf2!
      • threat
        • 2.0-0#
      • 1...Qc3+
        • 2.Bxc3#
      • 1...Qe5+
        • 2.Bxe5#
      • 1...Qb2
        • 2.Qxb2#
      • 1...Ba6
        • 2.Rxa6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • Q(c);N_GUARD::QAB1(C),XQ(c)
    • Q(c);CHECK,OGATE::B(F),XQ(c)
    • Q(c);OGATE,P_PINQ(C)::B(F),XQ(c)
    • B(d);N_GUARD::R(E),XB(d)
    • B(d);N_GUARD::R(E)
  • Tries
    • Try
      • B(F);CHECK,XQ(c)
      • Refutation
        • R(g);XB(F)
    • Try
      • R(E);XP(b)
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);CHECK,OGATE::B(F),XQ(c)
        • R(h);XB(G)::R(E)
        • R(g);::R(E)
        • B(d);::R(E)
      • Refutation
        • B(d);
    • Try
      • R(E);
      • Threat
        • R1(E)
      • Vars
        • Q(c);CHECK,OGATE::B(F),XQ(c)
        • Q(c);N_GUARD::QAB1(C),XQ(c)
        • B(d);N_GUARD::QAR(C)
      • Refutation
        • R(h);XB(G)
    • Try
      • Q(C);
      • Threat
        • DUALS(3)
      • Vars
        • Q(c);CHECK,OGATE::B(F),XQ(c)
        • Q(c);N_SPINQ(c),XB(F)::QAR1(C)
        • Q(c);::QAR1(C)
        • P(f);N_SPINQ(c)::QAR1(C)
      • Refutation
        • R(h);XB(G)
  • Actual
    • Q(C);
    • Threat
      • 0-0
    • Vars
      • Q(c);CHECK,OGATE::B(F),XQ(c)
      • Q(c);N_GUARD::QAB1(C),XQ(c)
      • B(d);N_GUARD::R(E),XB(d)
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