MESON Chess Problem Database

Problem Display
PID: 246365 (B2q4/5pPp/p1R4R/r4kB1/p5Nb/3Pp1pP/1QP1N3/1K6 w - - 0 1)

Froberg, Johan Hilding Laurentius

Sjakk-Nytt, 1947

B2q4/5pPp/p1R4R/r4kB1/p5Nb/3Pp1pP/1QP1N3/1K6

#2

12 + 10

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qf6
      • 2.Qxf6#
    • 1...Qc7
      • 2.Qf6#
    • 1...Qd5
      • 2.Qf6#
    • 1...Qd7
      • 2.Qf6#
    • 1...Qxa8
      • 2.Qf6#
    • 1...Qc8
      • 2.Qf6#
    • 1...Qe8
      • 2.Qf6#
    • 1...Qf8
      • 2.Qf6#
    • 1...Qg8
      • 2.Qf6#
    • 1...Qh8
      • 2.Qf6#
    • 1...Re5
      • 2.Qxe5#
  • Tries
    • 1.Rc5+?
      • 1...Qd5
        • 2.Qf6#
      • 1...Rxc5!
    • 1.Rcf6+?
      • 1...Qxf6
        • 2.Qxf6#
      • 1...Kxg5!
    • 1.Rhf6+?
      • 1...Qxf6
        • 2.Qxf6#
      • 1...Kxg5!
  • Keys
    • 1.g8Q!
      • threat
        • 2.Sxe3#
      • 1...Qxg5
        • 2.Qc8#
      • 1...Qxd3
        • 2.Rcf6#
      • 1...Qxg8
        • 2.Qf6#
      • 1...Bxg5
        • 2.Qxh7#
      • 1...Qb6
        • 2.Rhf6#
      • 1...Qe7
        • 2.Sd4#
      • 1...Qd4
        • 2.Sxd4#
      • 1...Qe8
        • 2.Sd4#
        • 2.Rcf6#
        • 2.Rhf6#
        • 2.Qf6#
      • 1...Re5
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 9
  • Sets
    • Q(j);N_GUARD::QAR1(B),XQ(j)
    • Q(j);N_GUARD::QAR1(B)
    • Q(j);N_GUARD,XB(L)::QAR1(B)
    • R(e);N_GUARD::QAR1(B),XR(e)
  • Tries
    • Try
      • R(I);CHECK
      • Vars
        • Q(j);P_SPINQ(j)::QAR1(B)
      • Refutation
        • R(e);XR(I)
    • Try
      • R(I);CHECK
      • Vars
        • Q(j);OGATE,XR(I)::QAR1(B),XQ(j)
      • Refutation
        • K(f);P-FLIGHT,XB(H)
    • Try
      • R(J);CHECK
      • Vars
        • Q(j);OGATE,XR(J)::QAR1(B),XQ(j)
      • Refutation
        • K(f);P-FLIGHT,XB(H)
  • Actual
    • P(K);
    • Threat
      • S(G),XP(a)
    • Vars
      • Q(j);OGATE,SBLOCK,XB(H)::QAB(K)
      • Q(j);N_GUARD,P_PINP(C),XP(E)::R1(I)
      • Q(j);N_GUARD,XQ(K)::QAR1(B)
      • B(d);SBLOCK,XB(H)::QAB(K),XP(i)
      • Q(j);N_GUARD,P_PINQ(B)::R1(J)
      • Q(j);N_GUARD::S(D)
      • Q(j);N_GUARD::S(D),XQ(j)
      • R(e);N_GUARD::QAR1(B),XR(e)
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Developed and maintained by Brian Stephenson.
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