MESON Chess Problem Database

Problem Display
PID: 87436 (8/4K3/8/1p2kpn1/1N5Q/5P2/8/8 w - - 0 1)

Becker, Samuel?

American Chess Problemist, 1950

8/4K3/8/1p2kpn1/1N5Q/5P2/8/8

#2

4 + 4

5454 Near Snap 2009
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Qc4?
      • threat
        • 2.Sd3#
        • 2.Sc6#
        • 2.f4#
      • 1...Sxf3
        • 2.Sd3#
        • 2.Sc6#
      • 1...Se4
        • 2.Sd3#
      • 1...f4
        • 2.Qd5#
        • 2.Qc5#
      • 1...Sh3
        • 2.Sd3#
        • 2.Sc6#
      • 1...Se6
        • 2.Sd3#
        • 2.Sc6#
      • 1...bxc4!
  • Keys
    • 1.Qf2!
      • 1...Kf4
        • 2.Sd3#
      • 1...Sxf3
        • 2.Qe3#
      • 1...Sh3
        • 2.Qe3#
      • 1...Se4
        • 2.f4#
      • 1...Se6
        • 2.Qe3#
      • 1...Sf7
        • 2.Qe3#
      • 1...Sh7
        • 2.Qe3#
      • 1...f4
        • 2.Qc5#

Anticipated by 95564(1892), 135253(1915), 193883(1916), 21976(1922)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(C);
      • Threat
        • DUALS(3)
      • Vars
        • S(d);::S(B)
      • Refutation
        • P(a);XQ(C)
  • Actual
    • Q(C);
    • Vars
      • K(b);S_FLIGHT::S(B)
      • S(d);N_GUARD,XP(A)::QAR2(C)
      • S(d);N_GUARD::QAR2(C)
      • S(d);SBLOCK::P(A)
      • P(c);SBLOCK::QAR2(C)
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