MESON Chess Problem Database

Problem Display
PID: 241450 (3Q4/q1pbr2p/1ppk2nR/1nN1NP2/1P1PK3/p1b5/8/3R4 w - - 0 1)

Hjelle, David

Arbejder-Skak, 1954

3Q4/q1pbr2p/1ppk2nR/1nN1NP2/1P1PK3/p1b5/8/3R4

#2

9 + 12

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qa4
      • 2.Sb7#
    • 1...Qa5
      • 2.Sb7#
    • 1...Qb7
      • 2.Sxb7#
    • 1...Rxe5+
      • 2.dxe5#
    • 1...Re6
      • 2.Qxd7#
    • 1...Rf7
      • 2.Sc4#
      • 2.Sxf7#
    • 1...Rg7
      • 2.Sc4#
    • 1...Re8
      • 2.Qxd7#
    • 1...bxc5
      • 2.dxc5#
  • Tries
    • 1.Rxg6+?
      • 1...Re6
        • 2.Rxe6#
        • 2.Qxd7#
        • 2.Qf8#
      • 1...hxg6!
  • Keys
    • 1.Se6!
      • threat
        • 2.Sc4#
      • 1...Rxe6
        • 2.Qxd7#
      • 1...Sxe5
        • 2.dxe5#
      • 1...c5
        • 2.dxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 7
  • Sets
    • Q(h);N_GUARD::S(E)
    • Q(h);N_GUARD::S(E),XQ(h)
    • R(k);CHECK,OGATE,XS(F)::R(A)+P(C)DCHECK,XR(k)
    • R(k);N_GUARD,N_SPINS(g)::QAR1(I),XB(j)
    • R(k);N_PINS(F)::S(F)
    • R(k);N_GUARD::QAR1(I),XB(j)
    • P(d);OGATE,XS(E)::R(A)+P(C)DCHECK,XP(d)
  • Tries
    • Try
      • R(H);CHECK,XS(g)
      • Refutation
        • P(l);XR(H)
  • Actual
    • S(E);N_PINS(g),N_SPINS(F)
    • Threat
      • S(F)
    • Vars
      • R(k);N_GUARD,P_PINS(F),XS(E)::QAR1(I),XB(j)
      • S(g);OGATE,XS(F)::R(A)+P(C)DCHECK,XS(g)
      • P(e);OGATE::R(A)+P(C)DCHECK,XP(e)
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