MESON Chess Problem Database

Problem Display
PID: 158377 (4RR1B/2q1r1N1/2Bp4/3bkP1P/2P1N3/4P3/2Q5/b2K4 w - - 0 1)

Barth, Michael

Papack, Daniel

3rd Prize, Schach-Aktiv, 2011

4RR1B/2q1r1N1/2Bp4/3bkP1P/2P1N3/4P3/2Q5/b2K4

#2

12 + 6

15148 Sadier Collection 2016
56 The Problemist 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Bxc4
      • 2.Qh2#
    • 1...Bxe4
      • 2.Qxe4#
      • 2.Qh2#
    • 1...Be6
      • 2.Qh2#
    • 1...Bf7
      • 2.Qh2#
    • 1...Bg8
      • 2.Qh2#
  • Tries
    • 1.Sg5?
      • threat
        • 2.Qh2#
      • 1...Bf3+
        • 2.Sxf3#
      • 1...Bf7
        • 2.S7e6#
      • 1...Bg2!
    • 1.Sf6?
      • threat
        • 2.Sg4#
        • 2.Qh2#
      • 1...Bf7
        • 2.Sg4#
      • 1...Bg2
        • 2.Sg4#
      • 1...Bf3+!
    • 1.Rxe7+?
      • 1...Be6
        • 2.Sxe6#
        • 2.Se8#
        • 2.Rxe6#
        • 2.Qh2#
      • 1...Qxe7!
    • 1.Qc3+?
      • 1...Kxe4
        • 2.Bxd5#
      • 1...Bxc3!
  • Keys
    • 1.Rf7!
      • threat
        • 2.Se6#
      • 1...Rxe8
        • 2.Sxe8#
      • 1...Bxf7
        • 2.Qh2#
      • 1...Re6
        • 2.Sxe6#
      • 1...Be6
        • 2.Sxe6#
        • 2.Qh2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • B(b);XP(D)::QAB(B)
    • B(b);N_SPINR(f)::QAB(B)
    • B(b);::QAB(B)
  • Tries
    • Try
      • S(E);
      • Threat
        • QAB(B)
      • Vars
        • B(b);CHECK,N_GUARD::S(E),XB(b)
        • B(b);::B(L)+S(I)
      • Refutation
        • B(b);
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Vars
        • B(b);::S(E)
      • Refutation
        • B(b);CHECK
    • Try
      • R(J);CHECK,XR(f)
      • Refutation
        • Q(e);XR(J)
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);P-FLIGHT,P_SPINB(b),XS(E)::B(H),XB(b)
      • Refutation
        • B(a);XQ(B)
  • Actual
    • R(K);
    • Threat
      • B(L)+S(I)
    • Vars
      • R(f);N_SPINR(f),XR(J)::B(L)+S(I),XR(f)
      • B(b);XR(K)::QAB(B)
      • R(f);::B(L)+S(I),XR(f)
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