MESON Chess Problem Database

Problem Display
PID: 168432 (q7/1rQB4/2Pp4/R1pkn1p1/1P1B1Pn1/2KN2N1/8/3R3r w - - 0 1)

Petite, Efren

2nd Prize, Problemas, 1979

q7/1rQB4/2Pp4/R1pkn1p1/1P1B1Pn1/2KN2N1/8/3R3r

#2

11 + 9

6490 yacpdb 2018
5454 Near Snap 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb4
      • 2.Sxb4#
    • 1...Sxc6
      • 2.Qxc6#
    • 1...gxf4
      • 2.Sxf4#
  • Tries
    • 1.Bxc5?
      • threat
        • 2.Qxd6#
      • 1...Rxc7
        • 2.Ba7#
      • 1...dxc5
        • 2.Rxc5#
      • 1...Qb8
        • 2.Bb6#
      • 1...Qf8
        • 2.Bb6#
      • 1...Rh6
        • 2.Sxe5#
      • 1...Sf7
        • 2.Se1#
      • 1...Sc4!
    • 1.Bxe5?
      • threat
        • 2.Se1#
        • 2.Qxd6#
      • 1...Rxd1
        • 2.Qxd6#
      • 1...Rxb4
        • 2.Sxb4#
        • 2.Qxd6#
      • 1...Rxc7
        • 2.Se1#
      • 1...gxf4
        • 2.Qxd6#
      • 1...dxe5
        • 2.Se1#
        • 2.Rxc5#
      • 1...Qa6
        • 2.Qxd6#
      • 1...Qb8
        • 2.Se1#
      • 1...Qf8
        • 2.Se1#
      • 1...Re1
        • 2.Sxe1#
        • 2.Qxd6#
      • 1...Rh2
        • 2.Sf2#
        • 2.Qxd6#
      • 1...Rh6
        • 2.Sc1#
        • 2.Se1#
        • 2.Sb2#
        • 2.Sf2#
        • 2.Sxc5#
      • 1...Sf2
        • 2.Qxd6#
      • 1...Se3
        • 2.Qxd6#
      • 1...Sxe5!
  • Keys
    • 1.Sxc5!
      • threat
        • 2.Be6#
      • 1...Rxc7
        • 2.Sa6#
      • 1...Sxd7
        • 2.Bg1#
      • 1...dxc5
        • 2.Rxc5#
      • 1...Qc8
        • 2.Sxb7#
      • 1...Qe8
        • 2.Sxb7#
      • 1...Qg8
        • 2.Sxb7#
      • 1...Rh6
        • 2.Bxe5#

Anticipated by 163465(1978)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 3
  • Sets
    • R(h);XP(E)::S(C),XR(h)
    • S(e);OGATE,XP(I)::QAB1(J),XS(e)
    • P(f);XP(G)::S(C),XP(f)
  • Tries
    • Try
      • B(F);XP(c)
      • Threat
        • QAR1(J),XP(g)
      • Vars
        • R(h);N_GUARD,XQ(J)::R(H)+B(F)
        • P(g);OGATE,P_SPINP(g),XB(F)::R1(H),XP(g)
        • Q(i);N_GUARD::R(H)+B(F)
        • R(a);N_GUARD::R(A)+S(C),XS(e)
        • S(e);N_GUARD::R(A)+S(C)
      • Refutation
        • S(e);
    • Try
      • B(F);XS(e)
      • Threat
        • DUALS(2)
      • Vars
        • R(a);XR(A)::QAR1(J),XP(g)
        • R(h);XQ(J)::R(A)+S(C)
        • P(f);XP(G)::QAR1(J),XP(g)
        • Q(i);::QAR1(J),XP(g)
        • Q(i);::R(A)+S(C)
        • S(b);::QAR1(J),XP(g)
      • Refutation
        • S(b);XB(F)
  • Actual
    • S(C);XP(c)
    • Threat
      • B(K)
    • Vars
      • R(h);N_GUARD,XQ(J)::R(H)+S(C)
      • S(e);N_GUARD,XB(K)::R(A)+B(F)
      • P(g);OGATE,P_SPINP(g),XS(C)::R1(H),XP(g)
      • Q(i);N_GUARD::R(H)+S(C),XR(h)
      • R(a);N_GUARD::R(A)+B(F),XS(e)
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