MESON Chess Problem Database

Problem Display
PID: 79415 (7N/4R1B1/q5n1/p1r4p/2N1Pk1P/K3pP2/3R3P/2QB2r1 w - - 0 1)

Petite, Efren

Die Schwalbe, 2008

7N/4R1B1/q5n1/p1r4p/2N1Pk1P/K3pP2/3R3P/2QB2r1

#2

12 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...exd2
      • 2.Qxd2#
    • 1...e2
      • 2.Rd3#
  • Tries
    • 1.Rg2?
      • threat
        • 2.Qxe3#
      • 1...Qxc4
        • 2.Sxg6#
      • 1...Rxc4
        • 2.Bh6#
      • 1...Re1!
    • 1.Rd6?
      • threat
        • 2.Qxe3#
      • 1...Rxc4
        • 2.Rf7#
      • 1...Re1
        • 2.Sxg6#
      • 1...Qxc4!
    • 1.Rf7+?
      • 1...Rf5
        • 2.Rxf5#
      • 1...Qf6!
  • Keys
    • 1.Rd5!
      • threat
        • 2.Qxe3#
      • 1...Qxc4
        • 2.Rf7#
      • 1...Rxc4
        • 2.Rf5#
      • 1...Re1
        • 2.Bh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • P(b);OGATE,P_SPINP(b),XR(C)::QAB(A),XP(b)
    • P(b);OGATEB::QAB(A)+R(C)
  • Tries
    • Try
      • R(C);P_PINP(b)
      • Threat
        • QAB1(A),XP(b)
      • Vars
        • Q(g);N_GUARD,XS(G)::S(L),XS(h)
        • R(e);N_GUARD,XS(G)::B(K)
      • Refutation
        • R(a);
    • Try
      • R(C);P_PINP(b)
      • Threat
        • QAB1(A),XP(b)
      • Vars
        • R(e);N_GUARD,XS(G)::R(J)
        • R(a);N_GUARD::S(L),XS(h)
      • Refutation
        • Q(g);XS(G)
    • Try
      • R(J);CHECK
      • Vars
        • R(e);N_GUARD,P_SPINR(e)::R1(J),XR(e)
      • Refutation
        • Q(g);P_SPINQ(g)
  • Actual
    • R(C);P_PINP(b)
    • Threat
      • QAB1(A),XP(b)
    • Vars
      • Q(g);N_GUARD,XS(G)::R(J)
      • R(e);N_GUARD,XS(G)::R1(C)
      • R(a);N_GUARD::B(K)
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