MESON Chess Problem Database

Problem Display
PID: 239990 (8/r7/2R1NB2/1B1k1n2/3ppp2/pNpR3r/2n3Qb/2K5 w - - 0 1)

Petite, Efren

Sinfonie Scacchistiche, 1974

8/r7/2R1NB2/1B1k1n2/3ppp2/pNpR3r/2n3Qb/2K5

#2

8 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rg3
      • 2.Sxf4#
    • 1...Ra4
      • 2.Sc7#
    • 1...Ra5
      • 2.Sc7#
    • 1...Ra6
      • 2.Sc7#
    • 1...Rc7
      • 2.Sxc7#
    • 1...Ra8
      • 2.Sc7#
    • 1...Bg1
      • 2.Sxf4#
    • 1...Sg3
      • 2.Sxf4#
  • Tries
    • 1.Sexd4?
      • threat
        • 2.Bc4#
      • 1...Sfxd4
        • 2.Qg5#
      • 1...Ra4
        • 2.Qg8#
      • 1...Sce3
        • 2.Sxf5#
      • 1...Sfe3
        • 2.Sxc2#
      • 1...Sd6
        • 2.Rc5#
      • 1...Scxd4!
  • Keys
    • 1.Sbxd4!
      • threat
        • 2.Bc4#
      • 1...Scxd4
        • 2.Qa2#
      • 1...Sfxd4
        • 2.Qg5#
      • 1...Ra4
        • 2.Sc7#
      • 1...Sce3
        • 2.Sxf5#
      • 1...Sfe3
        • 2.Sxc2#
      • 1...Sd6
        • 2.Rc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 7
  • Sets
    • R(e);S_CUTB(b)::S(G),XP(h)
    • R(k);N_GUARD::S(G)
    • R(k);N_GUARD::S(G),XR(k)
    • B(b);N_GUARD::S(G),XP(h)
    • S(j);S_CUTB(b)::S(G),XP(h)
  • Tries
    • Try
      • S(G);P_PINP(g),XP(f)
      • Threat
        • B(E)
      • Vars
        • S(j);OGATEB,P_SPINS(j),XS(G)::QAR(B)
        • R(k);N_GUARD::QAB(B)
        • S(a);N_GUARD,S_CUTR(e)::R(D)+S(G),XS(j)
        • S(j);N_GUARD,S_CUTR(e)::R(D)+S(G),XS(a)
        • S(j);SBLOCK::R1(F)
      • Refutation
        • S(a);P_SPINS(a),XS(G)
  • Actual
    • S(C);P_PINP(g),XP(f)
    • Threat
      • B(E)
    • Vars
      • S(a);OGATE,P_SPINS(a),XS(C)::QAB(B)
      • S(j);OGATEB,P_SPINS(j),XS(C)::QAR(B)
      • R(k);N_GUARD::S(G)
      • S(a);N_GUARD,S_CUTR(e)::R(D)+S(C),XS(j)
      • S(j);N_GUARD,S_CUTR(e)::R(D)+S(C),XS(a)
      • S(j);SBLOCK::R1(F)
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