MESON Chess Problem Database

Problem Display
PID: 53 (2Qq1rB1/2pPPPP1/n3kN2/K2Npnr1/1p2P2b/8/8/8 w - - 0 1)

Petrovic, Nenad

2nd Prize, Els Escacs a Catalunya, 1930

2Qq1rB1/2pPPPP1/n3kN2/K2Npnr1/1p2P2b/8/8/8

#2

10 + 10

785 Het Belgisch Schaakbord (L'Echiquier Belge) 1951
3098 FIDE Album (1914-1944) (I) 1971

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd7
      • 2.Qxd7#
    • 1...Qe8
      • 2.dxe8S#
    • 1...Re8
      • 2.fxe8S#
  • Tries
    • 1.exd8S+?
      • 1...Rxd8
        • 2.f8Q#
        • 2.f8B#
      • 1...Kd6!
    • 1.exf8S+?
      • 1...Qxf8
        • 2.d8Q#
        • 2.d8R#
      • 1...Kd6!
    • 1.gxf8S+?
      • 1...Qxf8
        • 2.d8Q#
        • 2.d8R#
      • 1...Kd6!
  • Keys
    • 1.Se8!
      • threat
        • 2.exd8S#
        • 2.exf8S#
        • 2.gxf8S#
      • 1...c5+
        • 2.exd8S#
      • 1...c6+
        • 2.exd8S#
      • 1...Qxe7
        • 2.d8S#
      • 1...Qxd7
        • 2.exf8S#
        • 2.gxf8S#
      • 1...Qxc8
        • 2.dxc8Q#
        • 2.dxc8B#
        • 2.exf8S#
        • 2.gxf8S#
      • 1...Qxe8
        • 2.dxe8S#
      • 1...Rxg7
        • 2.exf8S#
      • 1...Rxf7
        • 2.exd8S#
      • 1...Rxe8
        • 2.fxe8S#
      • 1...Rxg8
        • 2.exd8S#
        • 2.fxg8Q#
        • 2.fxg8B#
      • 1...Sxe7
        • 2.gxf8S#
      • 1...Sxg7
        • 2.exd8S#
        • 2.exf8S#
      • 1...Rg1
        • 2.exf8S#
        • 2.gxf8S#
      • 1...Rg2
        • 2.exf8S#
        • 2.gxf8S#
      • 1...Rg3
        • 2.exf8S#
        • 2.gxf8S#
      • 1...Rg4
        • 2.exf8S#
        • 2.gxf8S#
      • 1...Rh5
        • 2.exf8S#
        • 2.gxf8S#
      • 1...Rg6
        • 2.exf8S#
        • 2.gxf8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • Q(i);OGATE,P_SPINQ(i),XP(E)::QAB1(I),XQ(i)
    • Q(i);OGATE::PXQ(i)=S
    • R(j);OGATE::PXR(j)=S
  • Tries
    • Try
      • P(F);CHECK,XQ(i)
      • Vars
        • R(j);OGATE,XS(F)::P=Q
      • Refutation
        • K(g);P-FLIGHT
    • Try
      • P(F);CHECK,XR(j)
      • Vars
        • Q(i);OGATE,XS(F)::P=Q
      • Refutation
        • K(g);P-FLIGHT
    • Try
      • P(H);CHECK,XR(j)
      • Vars
        • Q(i);OGATE,XS(H)::P=Q
      • Refutation
        • K(g);P-FLIGHT
  • Actual
    • S(D);
    • Threat
      • DUALS(3)
    • Vars
      • P(h);CHECK::PXQ(i)=S
      • Q(i);OGATE,XP(F)::P=S
      • Q(i);OGATE,XS(D)::PXQ(i)=S
      • R(e);XP(H)::PXR(j)=S
      • R(j);P_SPINR(j),XP(G)::PXQ(i)=S
      • R(j);OGATE,XS(D)::PXR(j)=S
      • S(d);XP(F)::PXR(j)=S
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