MESON Chess Problem Database

Problem Display
PID: 134845 (4nB2/3NQpbB/6b1/q1PP4/3kP3/1P6/1PK1RP2/8 w - - 0 1)

Petite, Efren

Die Schwalbe, 2009

4nB2/3NQpbB/6b1/q1PP4/3kP3/1P6/1PK1RP2/8

#2

12 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qd2+
      • 2.Rxd2#
    • 1...Qc3+
      • 2.bxc3#
    • 1...Qb6
      • 2.Rd2#
    • 1...Qc7
      • 2.Rd2#
    • 1...Qd8
      • 2.Rd2#
    • 1...Qa1
      • 2.Rd2#
    • 1...Qa2
      • 2.Rd2#
    • 1...Qa3
      • 2.Rd2#
    • 1...Qa4
      • 2.Rd2#
    • 1...Qxc5+
      • 2.Qxc5#
    • 1...Qa7
      • 2.Rd2#
    • 1...Qa8
      • 2.Rd2#
    • 1...Bxe4+
      • 2.Qxe4#
    • 1...Be5
      • 2.Qxe5#
    • 1...Bh6
      • 2.Qe5#
    • 1...Bxf8
      • 2.Qe5#
    • 1...Sf6
      • 2.Qe5#
  • Tries
    • 1.Bxg7+?
      • 1...Sf6
        • 2.Bxf6#
        • 2.Qxf6#
        • 2.Qe5#
      • 1...Sxg7
        • 2.Qf6#
        • 2.Qe5#
      • 1...f6!
  • Keys
    • 1.Qg5!
      • threat
        • 2.Qe3#
      • 1...Qd2+
        • 2.Qxd2#
      • 1...Qc3+
        • 2.bxc3#
      • 1...Qxc5+
        • 2.Bxc5#
      • 1...Bxe4+
        • 2.Rxe4#
      • 1...Bh6
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 12
  • Sets
    • Q(b);CHECK,N_GUARD::R(C),XQ(b)
    • Q(b);CHECK,OGATE::P(A),XQ(b)
    • Q(b);N_GUARD::R(C)
    • Q(b);N_GUARD,N_PINP(F),P_PINP(A)::R(C)
    • Q(b);N_GUARD,N_PINP(F),P_PINP(E)::R(C)
    • Q(b);CHECK,OGATE,XP(G)::QAB1(J),XQ(b)
    • B(c);CHECK,OGATE,XP(F)::QAR1(J),XB(c)
    • B(e);N_GUARD::QAB1(J),XB(e)
    • B(e);N_GUARD::QAB1(J)
    • B(e);N_GUARD,XB(L)::QAB1(J)
    • S(f);S_CUTB(e)::QAB1(J)
  • Tries
    • Try
      • B(L);CHECK,XB(e)
      • Refutation
        • P(d);P_SPINP(d)
  • Actual
    • Q(J);
    • Threat
      • QAB1(J)
    • Vars
      • Q(b);CHECK,N_GUARD::QAR2(J),XQ(b)
      • Q(b);CHECK,OGATE::P(A),XQ(b)
      • Q(b);CHECK,OGATE,XP(G)::B(L),XQ(b)
      • B(c);CHECK,OGATE,XP(F)::R1(C),XB(c)
      • B(e);N_GUARD::QAB1(J)
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