MESON Chess Problem Database

Problem Display
PID: 189851 (1Qn4b/p7/8/k7/8/P1P5/8/2K5 w - - 0 1)

Dehler, Otto Georg Edgar

Magyar Sakkvilag, 1912

1Qn4b/p7/8/k7/8/P1P5/8/2K5

#2

4 + 4

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Ka4
      • 2.Qb4#
    • 1...a6
      • 2.Qb4#
  • Tries
    • 1.c4?
      • threat
        • 2.Qb5#
      • 1...Ka4
        • 2.Qb4#
      • 1...Ka6
        • 2.Qb5#
      • 1...Sb6
        • 2.Qxa7#
      • 1...Sd6
        • 2.Qxa7#
      • 1...a6
        • 2.Qb4#
      • 1...Bb2+!
  • Keys
    • 1.a4!
      • threat
        • 2.Qb5#
      • 1...Kxa4
        • 2.Qb4#
      • 1...Ka6
        • 2.Qb5#
      • 1...Sb6
        • 2.Qxa7#
      • 1...Sd6
        • 2.Qxa7#
      • 1...a6
        • 2.Qb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::QAR1(D)
    • P(b);SBLOCK::QAB1(D)
  • Tries
    • Try
      • P(C);
      • Threat
        • QAR1(D)
      • Vars
        • K(a);P-FLIGHT::QAR1(D)
        • K(a);P-FLIGHT::QAB1(D)
        • S(c);N_GUARD::QAR2(D),XP(b)
        • P(b);SBLOCK::QAB1(D)
      • Refutation
        • B(d);CHECK
  • Actual
    • P(B);
    • Threat
      • QAR1(D)
    • Vars
      • K(a);P-FLIGHT,XP(B)::QAR1(D)
      • K(a);P-FLIGHT::QAB1(D)
      • S(c);N_GUARD::QAR2(D),XP(b)
      • P(b);SBLOCK::QAB1(D)
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