MESON Chess Problem Database

Problem Display
PID: 168371 (8/Q7/3p4/1Kp1r3/1pPk1P2/2r1N3/4P2B/3N3B w - - 0 1)

Petite, Efren

Die Schwalbe, 1990

8/Q7/3p4/1Kp1r3/1pPk1P2/2r1N3/4P2B/3N3B

#2

9 + 6

6490 yacpdb 2018
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rc2
      • 2.Sxc2#
    • 1...Ra3
      • 2.Sc2#
    • 1...Rb3
      • 2.Sc2#
    • 1...Rd3
      • 2.Sc2#
    • 1...Re4
      • 2.Sf5#
    • 1...Rf5
      • 2.Sxf5#
    • 1...Re6
      • 2.Sf5#
    • 1...Re7
      • 2.Sf5#
    • 1...Re8
      • 2.Sf5#
    • 1...d5
      • 2.Qxc5#
  • Tries
    • 1.Qa1?
      • threat
        • 2.Sc2#
      • 1...b3
        • 2.Qxc3#
      • 1...Rxe3!
  • Keys
    • 1.Bg1!
      • threat
        • 2.Sc2#
        • 2.Sf5#
      • 1...Rcxe3
        • 2.Qa1#
      • 1...Rexe3
        • 2.Qg7#
      • 1...Rc2
        • 2.Sxc2#
        • 2.Sf5#
      • 1...Rf5
        • 2.Sc2#
        • 2.Sxf5#

This anticipates 179404(2010)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 10
  • Sets
    • R(a);N_GUARD::S(E),XR(a)
    • R(a);N_GUARD::S(E)
    • R(e);N_GUARD::S(E)
    • R(e);N_GUARD::S(E),XR(e)
    • P(f);N_GUARD,S_CUTR(e)::QAB1(I),XP(d)
  • Tries
    • Try
      • Q(I);N_PINP(d),P_PINR(a)
      • Threat
        • S(E)
      • Vars
        • P(b);N_GUARD::QAB1(I),XR(a)
      • Refutation
        • R(e);XS(E)
  • Actual
    • B(D);
    • Threat
      • DUALS(2)
    • Vars
      • R(a);OGATEB,P_SPINR(a),XS(E)::QAB(I)
      • R(e);OGATEB,P_SPINR(e),XS(E)::QAB(I)
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