MESON Chess Problem Database

Problem Display
PID: 122942 (5b1q/7b/5B2/p1pQ4/8/3N4/1P1N4/k2K4 w - - 0 1)

Rietveld, Johannes Jacob

Western Daily Mercury, 1913

5b1q/7b/5B2/p1pQ4/8/3N4/1P1N4/k2K4

#2

6 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qg8
      • 2.b4#
  • Tries
    • 1.Qc4?
      • threat
        • 2.Qa4#
      • 1...Qg8
        • 2.b4#
      • 1...a4
        • 2.Qxa4#
      • 1...Bg8!
  • Keys
    • 1.Sb4!
      • threat
        • 2.Qa2#
      • 1...Bc2+
        • 2.Sxc2#
      • 1...axb4
        • 2.Qa8#
      • 1...cxb4
        • 2.Qxa5#
      • 1...Qg8
        • 2.b3#
      • 1...Bb1
        • 2.Sb3#
      • 1...Bg8
        • 2.Sc2#
      • 1...c4
        • 2.Qxa5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • Q(f);N_GUARD::B(F)+P(B)
  • Tries
    • Try
      • Q(E);
      • Threat
        • QAR(E)
      • Vars
        • Q(f);N_GUARD::B(F)+P(B)
        • P(b);::QAR(E),XP(b)
      • Refutation
        • B(d);
  • Actual
    • S(D);
    • Threat
      • QAR1(E)
    • Vars
      • B(d);CHECK,N_GUARD::S(D),XB(d)
      • P(b);OGATEB,XS(D)::QAB(E)
      • P(c);OGATE,XS(D)::QAR(E),XP(b)
      • Q(f);N_GUARD::B(F)+P(B)
      • B(d);SBLOCK::S(C)
      • B(d);N_GUARD::S(D)
      • P(c);OGATE::QAR(E),XP(b)
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