MESON Chess Problem Database

Problem Display
PID: 102150 (4Q3/pp6/1pp5/1k6/8/1K6/8/8 w - - 0 1)

Letzen, Einar

Hvar a Dag, 1927

4Q3/pp6/1pp5/1k6/8/1K6/8/8

#2

2 + 5

6490 yacpdb 2009
3713 Snap 2014
5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kc5
      • 2.Qe5#
  • Tries
    • 1.Qe2+?
      • 1...Kc5
        • 2.Qe5#
      • 1...Ka5!
  • Keys
    • 1.Qe4!
      • 1...Ka5
        • 2.Qa4#
      • 1...Kc5
        • 2.Qe5#
      • 1...Ka6
        • 2.Qa4#
      • 1...c5
        • 2.Qa4#
      • 1...a5
        • 2.Qc4#
      • 1...a6
        • 2.Qb4#

This anticipates 151923(1941), 138714(2010)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(a);N_SPINP(c),P-FLIGHT::QAR2(B)
  • Tries
    • Try
      • Q(B);CHECK,N_PINP(c)
      • Vars
        • K(a);P-FLIGHT::QAR2(B)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);N_PINP(c)
    • Vars
      • K(a);P-FLIGHT::QAR1(B)
      • K(a);P-FLIGHT::QAR2(B)
      • K(a);S_FLIGHT::QAR2(B)
      • P(c);SBLOCK::QAB1(B)
      • P(d);SBLOCK::QAB1(B)
      • P(d);SBLOCK::QAR1(B)
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