MESON Chess Problem Database

Problem Display
PID: 90303 (8/8/3pp3/4k3/8/4KQ2/8/8 w - - 0 1)

Keirans, Peteris

Die Schwalbe, 1930

8/8/3pp3/4k3/8/4KQ2/8/8

#2

2 + 3

5454 Near Snap 2009
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...d5
      • 2.Qf4#
  • Tries
    • 1.Qf2?
      • 1...d5
        • 2.Qf4#
      • 1...Kd5!
    • 1.Qf7?
      • 1...d5
        • 2.Qf4#
      • 1...Kd5!
    • 1.Qf8?
      • 1...d5
        • 2.Qf4#
      • 1...Kd5!
  • Keys
    • 1.Qf1!
      • 1...Kd5
        • 2.Qb5#
      • 1...d5
        • 2.Qf4#

Anticipated by 2562(0000), 23602(1879), 91942(1883), 4790(1891), 135915(1897), 206689(1925), 231572(1927), 231573(1927)

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • P(b);SBLOCK::QAB1(B)
  • Tries
    • Try
      • Q(B);
      • Vars
        • P(b);SBLOCK::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Vars
        • P(b);SBLOCK::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(c)
    • Try
      • Q(B);
      • Vars
        • P(b);SBLOCK::QAB1(B)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(a);P-FLIGHT::QAR2(B)
      • P(b);SBLOCK::QAB1(B)
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