MESON Chess Problem Database

Problem Display
PID: 121106 (8/P1K1P3/2B5/2k5/1ppp4/8/1P1P4/2Q5 w - - 0 1)

Niemeijer, Meindert

Inspanning en Ontspanning, 1969

8/P1K1P3/2B5/2k5/1ppp4/8/1P1P4/2Q5

#2

7 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...d3
      • 2.Qg1#
  • Tries
    • 1.Qa1?
      • threat
        • 2.Qa5#
      • 1...d3
        • 2.Qg1#
      • 1...c3!
    • 1.Qf1?
      • threat
        • 2.Qf5#
      • 1...d3
        • 2.Qg1#
        • 2.Qf2#
      • 1...c3
        • 2.Qb5#
      • 1...b3!
    • 1.Qh1?
      • threat
        • 2.Qd5#
        • 2.Qh5#
      • 1...c3
        • 2.Qd5#
      • 1...d3
        • 2.Qd5#
        • 2.Qg1#
      • 1...b3!
    • 1.a8Q?
      • threat
        • 2.Qa5#
        • 2.Qa7#
      • 1...b3
        • 2.Qa3#
        • 2.Qa5#
      • 1...d3
        • 2.Qg1#
        • 2.Qa7#
      • 1...c3!
    • 1.e8Q?
      • threat
        • 2.Qh5#
        • 2.Qe5#
        • 2.Qe7#
        • 2.Qf8#
      • 1...b3
        • 2.Qe7#
        • 2.Qf8#
      • 1...d3
        • 2.Qg1#
        • 2.Qe3#
        • 2.Qe5#
      • 1...c3!
  • Keys
    • 1.d3!
      • threat
        • 2.Qg5#
        • 2.Qxc4#
      • 1...b3
        • 2.Qxc4#
      • 1...c3
        • 2.Qg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • P(c);OGATEB::QAB(A)
  • Tries
    • Try
      • Q(A);N_PINP(b)
      • Threat
        • QAR2(A)
      • Vars
        • P(c);OGATEB::QAB(A)
      • Refutation
        • P(b);
    • Try
      • Q(A);N_PINP(b)
      • Threat
        • QAR(A)
      • Vars
        • P(b);OGATE::QAR1(A)
      • Refutation
        • P(a);
    • Try
      • Q(A);N_PINP(b)
      • Threat
        • DUALS(2)
      • Vars
        • P(b);::QAR1(A)
      • Refutation
        • P(a);
    • Try
      • P(E);
      • Threat
        • DUALS(2)
      • Refutation
        • P(b);
    • Try
      • P(G);
      • Threat
        • DUALS(4)
      • Refutation
        • P(b);
  • Actual
    • P(C);
    • Threat
      • DUALS(2)
    • Vars
      • P(a);::QAR1(A),XP(b)
      • P(b);::QAR(A)
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