MESON Chess Problem Database

Problem Display
PID: 208794 (8/1Q3P2/8/B3kp1K/8/8/3PN3/8 w - - 0 1)

Martindale, Frank W

Watertown (New York) Re-Union, 1876

8/1Q3P2/8/B3kp1K/8/8/3PN3/8

#2

6 + 2

5454 Near Snap 2020
6490 yacpdb 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Qd5+?
      • 1...Kf6
        • 2.f8Q#
      • 1...Kxd5!
    • 1.f8Q?
      • threat
        • 2.Qfe7#
      • 1...Ke6
        • 2.Qfe7#
      • 1...f4!
  • Keys
    • 1.Sf4!
      • 1...Kd4
        • 2.Qd5#
      • 1...Kxf4
        • 2.Bc7#
      • 1...Kd6
        • 2.Qc7#
      • 1...Kf6
        • 2.Bc3#

This anticipates 23345(1927), 22287(1934), 22386(1934), 176158(1954), 24220(1983), 211347(1986), 171300(1988), 23874(1996), 47813(1998), 165528(1998), 16167(2000), 26009(2001)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);S_FLIGHT::P=Q
      • Refutation
        • K(a);P-FLIGHT,XQ(E)
    • Try
      • P(F);
      • Threat
        • QAR2(F)
      • Vars
        • K(a);P-FLIGHT::QAR1(F)
      • Refutation
        • P(b);
  • Actual
    • S(B);
    • Vars
      • K(a);S_FLIGHT::QAR1(E)
      • K(a);S_FLIGHT,XS(B)::B(C)
      • K(a);S_FLIGHT::QAB1(E)
      • K(a);S_FLIGHT::B(C)
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