MESON Chess Problem Database

Problem Display
PID: 168465 (2N2n2/7r/1B1p3p/1P1knP1K/r4P1Q/8/3N4/8 w - - 0 1)

Petite, Efren

Problemas, 1958

2N2n2/7r/1B1p3p/1P1knP1K/r4P1Q/8/3N4/8

#2

8 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Re7
      • 2.Sxe7#
    • 1...Rh8
      • 2.Se7#
    • 1...Sc4
      • 2.Qh1#
    • 1...Sf7
      • 2.Se7#
  • Tries
    • 1.Qf6?
      • threat
        • 2.Qxd6#
      • 1...Sc4
        • 2.Qd4#
      • 1...Sf7
        • 2.Se7#
      • 1...Se6
        • 2.Qxe6#
      • 1...Rd7!
    • 1.Qh1+?
      • 1...Re4
        • 2.Qxe4#
      • 1...Sf3!
  • Keys
    • 1.Qe7!
      • threat
        • 2.Qxd6#
      • 1...Rxe7
        • 2.Sxe7#
      • 1...Sc4
        • 2.Qe4#
      • 1...Sf7
        • 2.Qb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • R(f);N_GUARD::S(H),XR(f)
    • R(f);N_GUARD::S(H)
    • S(c);N_GUARD,S_CUTR(a)::QAB(C)
    • S(c);S_CUTR(f)::S(H)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAR1(C),XP(d)
      • Vars
        • S(c);OGATE::QAR1(C)
        • S(c);S_CUTR(f)::S(H)
        • S(g);N_GUARD::QAB1(C),XS(g)
      • Refutation
        • R(f);
    • Try
      • Q(C);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAB1(C),XR(a)
      • Refutation
        • S(c);P_SPINS(c)
  • Actual
    • Q(C);
    • Threat
      • QAR1(C),XP(d)
    • Vars
      • R(f);XQ(C)::S(H),XR(f)
      • S(c);OGATE::QAB1(C)
      • S(c);N_GUARD,S_CUTR(f)::QAB(C)
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