MESON Chess Problem Database

Problem Display
PID: 229932 (1R4rk/1Q2n2p/1n5P/6N1/r4p2/8/8/5bK1 w - - 0 1)

Ohquist, Johannes

Deutsche Schachzeitung, 1920

1R4rk/1Q2n2p/1n5P/6N1/r4p2/8/8/5bK1

#2

5 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bg2
      • 2.Sf7#
    • 1...Sd5
      • 2.Qg7#
      • 2.Qxh7#
    • 1...Sf5
      • 2.Qxh7#
    • 1...Sc6
      • 2.Qg7#
      • 2.Qxh7#
    • 1...Sg6
      • 2.Sf7#
      • 2.Qg7#
      • 2.Qxh7#
    • 1...Sc8
      • 2.Qxh7#
  • Tries
    • 1.Rxg8+?
      • 1...Sxg8
        • 2.Sf7#
        • 2.Qg7#
        • 2.Qxh7#
      • 1...Kxg8!
    • 1.Qxe7?
      • threat
        • 2.Qf6#
        • 2.Qe5#
        • 2.Qg7#
        • 2.Qxh7#
      • 1...Rxb8
        • 2.Qg7#
        • 2.Qxh7#
      • 1...Rc8
        • 2.Qg7#
        • 2.Qxh7#
      • 1...Rd8
        • 2.Rxd8#
        • 2.Qxd8#
        • 2.Qg7#
        • 2.Qxh7#
      • 1...Re8
        • 2.Rxe8#
        • 2.Qg7#
        • 2.Qxh7#
        • 2.Qxe8#
      • 1...Rf8
        • 2.Rxf8#
        • 2.Qxf8#
        • 2.Qg7#
        • 2.Qxh7#
      • 1...Re4
        • 2.Qf6#
        • 2.Qg7#
        • 2.Qxh7#
      • 1...Ra5
        • 2.Qf6#
        • 2.Qg7#
        • 2.Qxh7#
      • 1...Bd3
        • 2.Qf6#
        • 2.Qe5#
        • 2.Qg7#
      • 1...Sc4
        • 2.Qf6#
        • 2.Qg7#
        • 2.Qxh7#
      • 1...Sd5
        • 2.Qg7#
        • 2.Qxh7#
      • 1...Sd7
        • 2.Qg7#
        • 2.Qxh7#
      • 1...Sc8
        • 2.Qxh7#
      • 1...Ra7!
  • Keys
    • 1.Qg2!
      • threat
        • 2.Sf7#
      • 1...Bc4
        • 2.Qb2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • B(a);N_PINS(B)::S(B)
    • S(e);OGATE::QAR1(D),XP(f)
    • S(e);N_SPINR(g),OGATE::QAR1(D),XP(f)
  • Tries
    • Try
      • R(E);CHECK,N_SPINS(B),XR(g)
      • Refutation
        • K(h);P-FLIGHT,XR(E)
    • Try
      • Q(D);XS(e)
      • Threat
        • DUALS(4)
      • Vars
        • S(d);N_SPINR(g)::QAR1(D),XP(f)
      • Refutation
        • R(b);
  • Actual
    • Q(D);N_SPINS(B)
    • Threat
      • S(B)
    • Vars
      • B(a);S_CUTR(b)::QAB(D)
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