MESON Chess Problem Database

Problem Display
PID: 16478 (K2b4/1P6/k7/2Q5/8/8/1r6/7B w - - 0 1)

Nielsen, Vilhelm

Arbejder-Skak, 1941

K2b4/1P6/k7/2Q5/8/8/1r6/7B

#2

4 + 3

2838 Fun with Chess Miniatures 1996
136 Problem Observer 2007
15422 Problemskak 2008

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.b8S#
    • 1...Rc2
      • 2.b8S#
    • 1...Rd2
      • 2.b8S#
    • 1...Re2
      • 2.b8S#
    • 1...Rf2
      • 2.b8S#
    • 1...Rg2
      • 2.b8S#
    • 1...Rh2
      • 2.b8S#
    • 1...Rb5
      • 2.Qa7#
    • 1...Rxb7
      • 2.Bxb7#
    • 1...Bb6
      • 2.b8S#
  • Tries
    • 1.b8Q?
      • threat
        • 2.Qca7#
        • 2.Qba7#
      • 1...Rb6
        • 2.Qa7#
      • 1...Rb7
        • 2.Bxb7#
        • 2.Qxb7#
      • 1...Bb6
        • 2.Bb7#
        • 2.Qb7#
        • 2.Qbc8#
      • 1...Rxb8+!
  • Keys
    • 1.Bc6!
      • threat
        • 2.Qa7#
      • 1...Rxb7
        • 2.Bxb7#
      • 1...Rb6
        • 2.Qa3#
      • 1...Bb6
        • 2.b8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • R(a);N_GUARD::P=S
    • R(a);SBLOCK::QAR1(B)
    • R(a);OGATE,XP(C)::B(A),XR(a)
    • B(c);S_CUTR(a)::P=S
  • Tries
    • Try
      • P(C);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);::QAR1(C)
      • Refutation
        • R(a);CHECK,XQ(C)
  • Actual
    • B(A);
    • Threat
      • QAR1(B)
    • Vars
      • R(a);OGATE,XP(C)::B(A),XR(a)
      • R(a);SBLOCK,S_CUTB(c)::QAR(B)
      • B(c);S_CUTR(a)::P=S
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