MESON Chess Problem Database

Problem Display
PID: 16870 (4R3/4N1nQ/1b1R4/4Bp1p/2Nnk3/1p4P1/4B3/7K w - - 0 1)

Valve, Leo Erland

1st Prize, Aseveli, 1944

4R3/4N1nQ/1b1R4/4Bp1p/2Nnk3/1p4P1/4B3/7K

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Ba5
      • 2.Rxd4#
    • 1...Bc7
      • 2.Rxd4#
    • 1...Bd8
      • 2.Rxd4#
    • 1...Sf3
      • 2.Bd3#
  • Tries
    • 1.Sd5?
      • threat
        • 2.Sd2#
        • 2.Sc3#
        • 2.Sf6#
      • 1...Sxe8
        • 2.Sc3#
      • 1...Ba5
        • 2.Sf6#
      • 1...Bd8
        • 2.Sd2#
        • 2.Sc3#
      • 1...Sf3
        • 2.Sc3#
        • 2.Sf6#
      • 1...Sb5
        • 2.Sd2#
        • 2.Sf6#
        • 2.Bxg7#
      • 1...Sde6
        • 2.Sc3#
        • 2.Sf6#
      • 1...Sge6
        • 2.Sc3#
        • 2.Sf6#
      • 1...Sxe2!
    • 1.Bf4?
      • threat
        • 2.Sd2#
      • 1...Sf3
        • 2.Bd3#
      • 1...Ba5!
  • Keys
    • 1.Sxf5!
      • threat
        • 2.Sd2#
      • 1...Sdxf5
        • 2.Bxg7#
      • 1...Sgxf5
        • 2.Bxd4#
      • 1...Sxe8
        • 2.Sxd4#
      • 1...Ba5
        • 2.Rxd4#
      • 1...Sf3
        • 2.Sxg7#
        • 2.Bd3#
      • 1...Sde6
        • 2.Sxg7#
      • 1...Sge6
        • 2.Sxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • B(f);N_GUARD::R1(F),XS(b)
    • S(b);SBLOCK::B(B)
  • Tries
    • Try
      • S(G);
      • Threat
        • DUALS(3)
      • Vars
        • S(g);XR(I)::S(G)
        • B(f);::S(G)
      • Refutation
        • S(b);XB(B)
    • Try
      • B(E);
      • Threat
        • S(D)
      • Vars
        • S(b);SBLOCK::B(B)
      • Refutation
        • B(f);
  • Actual
    • S(G);XP(d)
    • Threat
      • S(D)
    • Vars
      • S(b);N_GUARD,P_SPINS(b),XS(G)::R(I)+B(E),XS(g)
      • S(g);N_GUARD,P_SPINS(g),XS(G)::R(I)+B(E),XS(b)
      • S(g);N_GUARD,XR(I)::QAB(H)+S(G),XS(b)
      • B(f);N_GUARD::R1(F),XS(b)
      • S(b);N_GUARD::QAB(H)+S(G),XS(g)
      • S(g);N_GUARD::QAB(H)+S(G),XS(b)
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