MESON Chess Problem Database

Problem Display
PID: 11440 (2B5/4p1r1/R5n1/3NkbPp/R4Np1/pp2P3/rqQK4/B7 w - - 0 1)

Froberg, Johan Hilding Laurentius

Vart Hem, 1938

2B5/4p1r1/R5n1/3NkbPp/R4Np1/pp2P3/rqQK4/B7

#2

10 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qc3+
      • 2.Bxc3#
    • 1...Qd4+
      • 2.Bxd4#
      • 2.exd4#
    • 1...Be4
      • 2.Rxe4#
    • 1...Be6
      • 2.Rxe6#
  • Tries
    • 1.Sd3+?
      • 1...Kxd5
        • 2.Bb7#
      • 1...Bxd3!
    • 1.Bxb2+?
      • 1...axb2
        • 2.Qxf5#
        • 2.Qc3#
        • 2.Qc7#
      • 1...Rxb2!
    • 1.e4?
      • threat
        • 2.Sd3#
      • 1...Qc3+
        • 2.Bxc3#
      • 1...Qd4+
        • 2.Bxd4#
      • 1...Bxe4
        • 2.Rxe4#
      • 1...Sxf4!
  • Keys
    • 1.Sf6!
      • threat
        • 2.R4a5#
      • 1...Qc3+
        • 2.Bxc3#
      • 1...Qd4+
        • 2.Bxd4#
      • 1...Sxf4
        • 2.exf4#
      • 1...Bd3
        • 2.Sxd3#
      • 1...Be4
        • 2.Rxe4#
      • 1...Be6
        • 2.Rxe6#
      • 1...Bd7
        • 2.Sxd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(b);CHECK,OGATE::B(A),XQ(b)
    • B(g);N_GUARD::R1(E),XB(g)
    • B(g);N_GUARD::R1(I),XB(g)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(f);N_SPINQ(b),P-FLIGHT,XS(G)::B(J)
      • Refutation
        • B(g);XS(F)
    • Try
      • B(A);CHECK,N_SPINQ(B),XQ(b)
      • Refutation
        • R(a);P_PINQ(B),XB(A)
    • Try
      • P(D);
      • Threat
        • S(F)
      • Vars
        • Q(b);CHECK,OGATE::B(A),XQ(b)
        • B(g);OGATE,XP(D)::R1(E),XB(g)
      • Refutation
        • S(i);XS(F)
  • Actual
    • S(G);
    • Threat
      • R(E)
    • Vars
      • Q(b);CHECK,OGATE::B(A),XQ(b)
      • S(i);OGATE,XS(F)::P(D),XS(i)
      • B(g);N_GUARD::S(F),XB(g)
      • B(g);N_GUARD::R1(E),XB(g)
      • B(g);N_GUARD::R1(I),XB(g)
      • B(g);N_GUARD::S(G),XB(g)
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