MESON Chess Problem Database

Problem Display
PID: 221924 (8/6NK/8/6p1/6kp/5R2/8/3B4 w - - 0 1)

Hoffmann, Fritz

Stella Polaris, 1967

8/6NK/8/6p1/6kp/5R2/8/3B4

#2

4 + 3

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Sf5?
      • 1...h3
        • 2.Rf1#
        • 2.Rf2#
      • 1...Kh5!
    • 1.Se6?
      • 1...Kh5
        • 2.Rf5#
      • 1...h3!
    • 1.Se8?
      • threat
        • 2.Sf6#
      • 1...Kh5
        • 2.Sf6#
        • 2.Rf5#
      • 1...h3!
  • Keys
    • 1.Sh5!
      • threat
        • 2.Sf6#
      • 1...Kxh5
        • 2.Rf5#
      • 1...h3
        • 2.Rf4#

This anticipates 247915(1979), 158422(1986), 171314(1990), 174487(1998)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(C);
      • Vars
        • K(a);S_FLIGHT::B(A)+R(B)
      • Refutation
        • P(b);
    • Try
      • S(C);
      • Threat
        • S(C)
      • Refutation
        • P(b);
  • Actual
    • S(C);
    • Threat
      • S(C)
    • Vars
      • K(a);S_FLIGHT,XS(C)::B(A)+R(B)
      • P(b);SBLOCK::B(A)+R(B),DCHECK
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