MESON Chess Problem Database

Problem Display
PID: 196546 (1BB3Nr/4p1P1/K5pp/R2P2b1/Q2Pk2p/3Rp3/4PP2/6rb w - - 0 1)

Ruonala, Lauri Armas

Suomen Shakki, 1957

1BB3Nr/4p1P1/K5pp/R2P2b1/Q2Pk2p/3Rp3/4PP2/6rb

#2

12 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rg2
      • 2.f3#
    • 1...Bf6
      • 2.Rxe3#
    • 1...e5
      • 2.dxe5#
  • Tries
    • 1.Sf6+?
      • 1...Bxf6
        • 2.Rxe3#
      • 1...exf6!
    • 1.Qc6?
      • threat
        • 2.Qe6#
        • 2.Qxg6#
      • 1...e5
        • 2.dxe5 ep#
      • 1...e6
        • 2.Qxe6#
        • 2.dxe6#
      • 1...Bf4
        • 2.d6#
      • 1...Bf6!
    • 1.gxh8Q?
      • threat
        • 2.Qe5#
      • 1...e5
        • 2.Qxe5#
        • 2.dxe5#
      • 1...Bf6
        • 2.Rxe3#
      • 1...Bf4!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Qxg6#
      • 1...e5
        • 2.Qxe5#
      • 1...Bf4
        • 2.Sf6#
      • 1...Bf6
        • 2.Sxf6#

This is a version of 196539

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(a);S_CUTB(b)::P(B)
    • B(f);N_GUARD::R1(C),XP(c)
    • P(i);OGATE::QAR(D)+P(E),XP(i)
  • Tries
    • Try
      • S(L);CHECK
      • Vars
        • B(f);XS(L)::R1(C),XP(c)
      • Refutation
        • P(i);XS(L)
    • Try
      • Q(D);
      • Threat
        • DUALS(2)
      • Vars
        • P(i);OGATE::QAB(D)+P(G),XP(i),EP
        • B(f);SBLOCK::QAB(D)+P(G)
      • Refutation
        • B(f);
    • Try
      • P(I);XR(j)
      • Threat
        • QAR1(I)
      • Vars
        • B(f);N_GUARD::R1(C),XP(c)
      • Refutation
        • B(f);
  • Actual
    • Q(D);P_PINP(i)
    • Threat
      • QAB(D),XP(g)
    • Vars
      • P(i);OGATE::QAR1(D),XP(i)
      • B(f);N_GUARD::S(L)
      • B(f);N_GUARD::S(L),XB(f)
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