MESON Chess Problem Database

Problem Display
PID: 168456 (2K2Q2/2Pp4/N1p1P3/2Pk1B2/1p6/1P2R3/n1N2p1b/3rq2n w - - 0 1)

Petite, Efren

4th HM., Scacco!, 1979

2K2Q2/2Pp4/N1p1P3/2Pk1B2/1p6/1P2R3/n1N2p1b/3rq2n

#2

10 + 10

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bg1
      • 2.Qd6#
    • 1...Bd6
      • 2.Qxd6#
    • 1...Bxc7
      • 2.Sxc7#
    • 1...Sg3
      • 2.Qd6#
    • 1...Sc3
      • 2.Saxb4#
    • 1...dxe6
      • 2.Bxe6#
  • Tries
    • 1.Be4+?
      • 1...Ke5
        • 2.Qf5#
      • 1...Kxe6!
    • 1.Qf7?
      • threat
        • 2.exd7#
        • 2.e7#
      • 1...dxe6
        • 2.Bxe6#
        • 2.Qxe6#
      • 1...d6
        • 2.e7#
      • 1...Qxe3!
    • 1.exd7?
      • threat
        • 2.Be6#
        • 2.Qf7#
        • 2.Qg8#
      • 1...Qg1
        • 2.Be6#
        • 2.Qf7#
      • 1...Be5
        • 2.Qf7#
        • 2.Qg8#
      • 1...Qxe3!
    • 1.e7?
      • threat
        • 2.Qf7#
        • 2.Qg8#
      • 1...Qg1
        • 2.Qf7#
      • 1...Qxe3!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Be4#
      • 1...Qxe3
        • 2.Sxe3#
      • 1...Rd4
        • 2.Qxd4#
      • 1...Sg3
        • 2.Qe5#
      • 1...Sc3
        • 2.Scxb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • B(f);N_GUARD::QAR1(J)
    • B(f);N_GUARD::QAR1(J),XB(f)
    • B(f);XP(H)::S(F),XB(f)
    • S(c);S_CUTB(f)::QAR1(J)
    • S(d);N_GUARD,S_CUTQ(b)::S(F),XP(g)
    • P(j);OGATE,XP(G)::B(E),XP(j)
  • Tries
    • Try
      • B(E);CHECK
      • Vars
        • K(h);P-FLIGHT::QAR1(J)
      • Refutation
        • K(h);S_FLIGHT,XP(G)
    • Try
      • Q(J);
      • Threat
        • DUALS(2)
      • Vars
        • P(j);::QAB(J)+P(G)
      • Refutation
        • Q(b);XR(C)
    • Try
      • P(G);XP(j)
      • Threat
        • DUALS(3)
      • Refutation
        • Q(b);XR(C)
    • Try
      • P(G);
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);::QAB(J)
      • Refutation
        • Q(b);XR(C)
  • Actual
    • Q(J);
    • Threat
      • B(E)
    • Vars
      • Q(b);XR(C)::S(A),XQ(b)
      • R(a);N_GUARD::QAR1(J),XR(a)
      • S(c);S_CUTB(f)::QAR1(J)
      • S(d);N_GUARD,S_CUTQ(b)::S(A),XP(g)
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