MESON Chess Problem Database

Problem Display
PID: 78461 (1r3r2/b6B/2QB4/2pnP3/R1nkp2N/R7/1P2pP2/K1N2b2 w - - 0 1)

Johandl, Alois

7th HM., The Sun-Herald, 1961

1r3r2/b6B/2QB4/2pnP3/R1nkp2N/R7/1P2pP2/K1N2b2

#2

11 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rb6
      • 2.Qxc5#
    • 1...Rf5
      • 2.Sxf5#
    • 1...Rc8
      • 2.Sf5#
    • 1...Rd8
      • 2.Sf5#
    • 1...Re8
      • 2.Sf5#
    • 1...Rg8
      • 2.Sf5#
    • 1...Rh8
      • 2.Sf5#
    • 1...Bg2
      • 2.Sxe2#
    • 1...Bh3
      • 2.Sxe2#
    • 1...Sc3
      • 2.bxc3#
    • 1...Se3
      • 2.Qxe4#
      • 2.fxe3#
    • 1...Sb4
      • 2.Qxe4#
    • 1...Sf4
      • 2.Qxe4#
    • 1...Sb6
      • 2.Qxe4#
      • 2.Qxc5#
    • 1...Sf6
      • 2.Sf5#
    • 1...Sc7
      • 2.Qxe4#
    • 1...Se7
      • 2.Qxe4#
    • 1...e3
      • 2.Rd3#
  • Tries
    • 1.Sf3+?
      • 1...exf3
        • 2.Rd3#
      • 1...Rxf3!
  • Keys
    • 1.Bxe4!
      • threat
        • 2.Qxd5#
      • 1...Kxe4
        • 2.Rxc4#
      • 1...Sc3
        • 2.bxc3#
      • 1...Se3
        • 2.Rd3#
        • 2.fxe3#
      • 1...Sb4
        • 2.Sb3#
      • 1...Sf4
        • 2.Sf3#
      • 1...Sb6
        • 2.Sb3#
        • 2.Rd3#
      • 1...Sf6
        • 2.Sf3#
        • 2.Sf5#
        • 2.Rd3#
      • 1...Sc7
        • 2.Rd3#
      • 1...Se7
        • 2.Rd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 1
    • REMOVED MATES = 11
  • Sets
    • R(i);S_CUTB(h)::QAB1(I),XP(f)
    • R(j);N_GUARD::S(G),XR(j)
    • R(j);N_GUARD::S(G)
    • B(a);N_GUARD::S(B),XP(b)
    • S(g);OGATE::P(C),XS(g)
    • S(g);N_SPINS(c),OGATE::QAR1(I),XP(e)
    • S(g);OGATE::QAR1(I),XP(e)
    • S(g);S_CUTR(j)::S(G)
    • P(e);N_GUARD::R1(E)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • P(e);XS(G)::R1(E)
      • Refutation
        • R(j);XS(G)
  • Actual
    • B(K);XP(e)
    • Threat
      • QAR1(I),XS(g)
    • Vars
      • K(d);P-FLIGHT,XB(K)::R(F),XS(c)
      • S(g);OGATE::P(C),XS(g)
      • S(g);N_SPINS(c),S_CUTR(i)::S(B)
      • S(g);S_CUTR(j)::S(G)
      • S(g);::R1(E)
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