MESON Chess Problem Database

Problem Display
PID: 118213 (2r5/5q2/3p2PQ/3p1p2/RN1N1p2/4k3/5pP1/3R1B1K w - - 0 1)

Petkov, Petko Andonov

Sinfonie Scacchistiche, 1970

2r5/5q2/3p2PQ/3p1p2/RN1N1p2/4k3/5pP1/3R1B1K

#2

9 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Sbc2+?
      • 1...Rxc2
        • 2.Sxc2#
      • 1...Ke4!
    • 1.Sxd5+?
      • 1...Ke4
        • 2.Sc6#
      • 1...Qxd5!
    • 1.Sdc2+?
      • 1...Rxc2
        • 2.Sxc2#
      • 1...Ke4!
    • 1.Se2?
      • threat
        • 2.Qxf4#
      • 1...Ke4
        • 2.Qxf4#
      • 1...Qh7
        • 2.Sxd5#
      • 1...Rh8
        • 2.Sc2#
      • 1...Rc4!
    • 1.Ra2?
      • threat
        • 2.Re2#
      • 1...Ke4
        • 2.Re2#
      • 1...Rc2!
    • 1.Qh3+?
      • 1...f3
        • 2.Qxf3#
      • 1...Ke4!
    • 1.gxf7?
      • threat
        • 2.Qe6#
      • 1...Ke4
        • 2.Qe6#
      • 1...Re8
        • 2.fxe8Q#
        • 2.fxe8R#
      • 1...Rh8!
  • Keys
    • 1.Sd3!
      • threat
        • 2.Qxf4#
      • 1...Ke4
        • 2.Qxf4#
      • 1...Qh7
        • 2.Sxf5#
      • 1...Rh8
        • 2.Sc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • R(h);XS(F)::S(G),XR(h)
      • Refutation
        • K(b);N_SPINP(c),P-FLIGHT
    • Try
      • S(F);CHECK,XP(d)
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT::R(E)+S(G)
      • Refutation
        • Q(g);P_PINP(D),XS(F)
    • Try
      • S(G);CHECK
      • Vars
        • R(h);XS(G)::S(F),XR(h)
      • Refutation
        • K(b);N_SPINP(c),P-FLIGHT
    • Try
      • S(G);
      • Threat
        • QAB1(I),XP(c)
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT::QAR1(I),XP(c)
        • Q(g);N_GUARD,P_PINQ(I)::S(F),XP(d)
        • R(h);N_GUARD,P_PINQ(I)::S(F)
      • Refutation
        • R(h);
    • Try
      • R(E);
      • Threat
        • R1(E)
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT::R(E)
      • Refutation
        • R(h);
    • Try
      • Q(I);CHECK,N_PINP(c)
      • Vars
        • P(c);P_SPINP(c)::QAR1(I),XP(c)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • P(H);XQ(g)
      • Threat
        • QAR(I)
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT::QAR2(I)
        • R(h);OGATE::PXR(h)=Q
      • Refutation
        • R(h);P_PINQ(I)
  • Actual
    • S(F);
    • Threat
      • QAB1(I),XP(c)
    • Vars
      • K(b);N_SPINP(c),P-FLIGHT::QAR1(I),XP(c)
      • Q(g);N_GUARD,P_PINQ(I)::S(G),XP(e)
      • R(h);N_GUARD,P_PINQ(I)::S(G)
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