MESON Chess Problem Database

Problem Display
PID: 102386 (1r3QK1/R3B1pN/P3k3/R3N3/1p2Pp2/5p2/5nq1/3r4 w - - 0 1)

Cristoffanini, Guido

L'Echiquier, 1928

1r3QK1/R3B1pN/P3k3/R3N3/1p2Pp2/5p2/5nq1/3r4

#2

9 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qf1
      • 2.Sg5#
    • 1...Qh1
      • 2.Sg5#
    • 1...Qh3
      • 2.Sg5#
    • 1...Qh2
      • 2.Sg5#
    • 1...Qg5
      • 2.Sxg5#
    • 1...Rb5
      • 2.Qf5#
    • 1...Rb6
      • 2.Qf5#
      • 2.Qf7#
    • 1...Rb7
      • 2.Qf7#
    • 1...Rxf8+
      • 2.Sxf8#
    • 1...Sg4
      • 2.Sg5#
  • Tries
    • 1.Sxf3?
      • threat
        • 2.Re5#
      • 1...Rxf8+
        • 2.Sxf8#
      • 1...Qxf3
        • 2.Sg5#
      • 1...Qg5
        • 2.Sfxg5#
        • 2.Shxg5#
      • 1...Rd5
        • 2.exd5#
      • 1...Rb5
        • 2.Qf7#
      • 1...Sd3
        • 2.Sd4#
      • 1...Sg4
        • 2.Sfg5#
        • 2.Shg5#
      • 1...Rb7!
  • Keys
    • 1.Sc6!
      • threat
        • 2.Re5#
      • 1...Rxf8+
        • 2.Sxf8#
      • 1...Rb7
        • 2.Qf5#
      • 1...Qg5
        • 2.Sxg5#
      • 1...Rd5
        • 2.exd5#
      • 1...Rb5
        • 2.Qf7#
      • 1...Sd3
        • 2.Sd4#
      • 1...Sg4
        • 2.Sg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(c);N_GUARD::S(G)
    • Q(c);N_GUARD::S(G),XQ(c)
    • R(i);N_PINQ(H)::QAB1(H)
    • R(i);CHECK,XQ(H)::S(G),XR(i)
    • S(b);S_CUTQ(c)::S(G)
  • Tries
    • Try
      • S(C);XP(d)
      • Threat
        • R1(B)
      • Vars
        • R(i);CHECK,XQ(H)::S(G),XR(i)
        • Q(c);N_GUARD,XS(C)::S(G)
        • R(a);OGATE::P(A),XR(a)
        • R(i);N_PINQ(H)::QAB1(H)
        • S(b);S_CUTR(a)::S(C)
      • Refutation
        • R(i);N_PINQ(H)
  • Actual
    • S(C);
    • Threat
      • R1(B)
    • Vars
      • R(i);CHECK,XQ(H)::S(G),XR(i)
      • R(i);N_PINQ(H)::QAB1(H)
      • Q(c);N_GUARD::S(G),XQ(c)
      • R(a);OGATE::P(A),XR(a)
      • S(b);S_CUTR(a)::S(C)
      • S(b);S_CUTQ(c)::S(G)
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Developed and maintained by Brian Stephenson.
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