MESON Chess Problem Database

Problem Display
PID: 241381 (2bNK3/1p1pPQP1/1Ppk2P1/2p2rp1/2B2pN1/5P2/8/8 w - - 0 1)

Hjelle, David

Norsk Sjakkblad, 1936

2bNK3/1p1pPQP1/1Ppk2P1/2p2rp1/2B2pN1/5P2/8/8

#2

10 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rd5
      • 2.Qf6#
    • 1...Rf6
      • 2.Qxf6#
    • 1...Rxf7
      • 2.Sxf7#
  • Tries
    • 1.Kf8?
      • threat
        • 2.e8S#
      • 1...Rxf7+
        • 2.Sxf7#
      • 1...Re5!
    • 1.g8Q?
      • 1...Rxf7
        • 2.Sxf7#
      • 1...Rd5
        • 2.Qf6#
      • 1...Rf6
        • 2.Qxf6#
      • 1...Re5!
    • 1.g8S?
      • 1...Rxf7
        • 2.Sxf7#
      • 1...Rd5
        • 2.Qf6#
      • 1...Rf6
        • 2.Qxf6#
      • 1...Re5!
    • 1.g8B?
      • 1...Rxf7
        • 2.Sxf7#
      • 1...Rd5
        • 2.Qf6#
      • 1...Rf6
        • 2.Qxf6#
      • 1...Re5!
    • 1.g8R?
      • 1...Rxf7
        • 2.Sxf7#
      • 1...Rd5
        • 2.Qf6#
      • 1...Rf6
        • 2.Qxf6#
      • 1...Re5!
  • Keys
    • 1.Qf8!
      • 1...Rxf8+
        • 2.exf8Q#
        • 2.exf8B#
      • 1...Re5
        • 2.Sf7#
      • 1...Rd5
        • 2.Qf6#
      • 1...Rf6
        • 2.Qxf6#
      • 1...Rf7
        • 2.Sxf7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(c);N_GUARD::QAR2(G)
    • R(c);N_GUARD::QAR2(G),XR(c)
    • R(c);XQ(G)::S(I),XR(c)
  • Tries
    • Try
      • K(J);P-FLIGHT,P_SPINQ(G)
      • Threat
        • P=S
      • Vars
        • R(c);CHECK,XQ(G)::S(I),XR(c)
      • Refutation
        • R(c);N_PINQ(G)
    • Try
      • P(H);
      • Vars
        • R(c);XQ(G)::S(I),XR(c)
        • R(c);N_GUARD::QAR2(G)
        • R(c);N_GUARD::QAR2(G),XR(c)
      • Refutation
        • R(c);P_PINP(F)
    • Try
      • P(H);
      • Vars
        • R(c);XQ(G)::S(I),XR(c)
        • R(c);N_GUARD::QAR2(G)
        • R(c);N_GUARD::QAR2(G),XR(c)
      • Refutation
        • R(c);P_PINP(F)
    • Try
      • P(H);
      • Vars
        • R(c);XQ(G)::S(I),XR(c)
        • R(c);N_GUARD::QAR2(G)
        • R(c);N_GUARD::QAR2(G),XR(c)
      • Refutation
        • R(c);P_PINP(F)
    • Try
      • P(H);
      • Vars
        • R(c);XQ(G)::S(I),XR(c)
        • R(c);N_GUARD::QAR2(G)
        • R(c);N_GUARD::QAR2(G),XR(c)
      • Refutation
        • R(c);P_PINP(F)
  • Actual
    • Q(G);
    • Vars
      • R(c);CHECK,OGATE,XQ(G)::PXR(c)=Q
      • R(c);N_GUARD,P_PINP(F)::S(I)
      • R(c);N_GUARD::QAR2(G)
      • R(c);N_GUARD::QAR2(G),XR(c)
      • R(c);N_GUARD::S(I),XR(c)
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