MESON Chess Problem Database

Problem Display
PID: 239994 (8/2B1p3/r1Pn4/2kNQ1N1/PRp3n1/1PPr3b/3R4/1K6 w - - 0 1)

Petite, Efren

Sinfonie Scacchistiche, 1978

8/2B1p3/r1Pn4/2kNQ1N1/PRp3n1/1PPr3b/3R4/1K6

#2

11 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd5
      • 2.Qxd5#
    • 1...Rxc6
      • 2.Se6#
    • 1...Se4
      • 2.Rxc4#
    • 1...Sb5
      • 2.Rxc4#
    • 1...Sf5
      • 2.Rxc4#
    • 1...Sb7
      • 2.Rxc4#
    • 1...Sf7
      • 2.Rxc4#
    • 1...Sc8
      • 2.Rxc4#
    • 1...Se8
      • 2.Rxc4#
    • 1...e6
      • 2.Qxd6#
  • Tries
    • 1.Sxe7+?
      • 1...Rd5
        • 2.Se6#
        • 2.Bxd6#
        • 2.Rxd5#
        • 2.Qxd5#
      • 1...Sxe5!
    • 1.Se4+?
      • 1...Sxe4
        • 2.Rxc4#
      • 1...Kxc6!
    • 1.Bxd6+?
      • 1...exd6
        • 2.Rxc4#
      • 1...Kxc6!
  • Keys
    • 1.Qxe7!
      • threat
        • 2.Qxd6#
      • 1...Kxd5
        • 2.Qxd6#
      • 1...Kxc6
        • 2.Qxd6#
      • 1...Rxd5
        • 2.Rxc4#
      • 1...Rxc6
        • 2.Rb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 8
  • Sets
    • R(a);OGATE,P_SPINR(a),XS(G)::QAR1(H),XR(a)
    • R(f);SBLOCK,XP(J)::S(I)
    • S(g);N_GUARD::R1(F),XP(c)
    • P(h);N_GUARD::QAB1(H),XS(g)
  • Tries
    • Try
      • S(G);CHECK,XP(h)
      • Refutation
        • S(d);XQ(H)
    • Try
      • S(I);CHECK
      • Vars
        • S(g);XS(I)::R1(F),XP(c)
      • Refutation
        • K(e);P-FLIGHT,XP(J)
    • Try
      • B(K);CHECK,XS(g)
      • Vars
        • P(h);XB(K)::R1(F),XP(c)
      • Refutation
        • K(e);P-FLIGHT,XP(J)
  • Actual
    • Q(H);P_PINS(g),XP(h)
    • Threat
      • QAB1(H),XS(g)
    • Vars
      • K(e);N_SPINS(g),P-FLIGHT,P_SPINR(a),XS(G)::QAR1(H),XS(g)
      • K(e);N_SPINS(g),P-FLIGHT,XP(J)::QAR1(H),XS(g)
      • R(a);XS(G)::R1(F),XP(c)
      • R(f);SBLOCK,XP(J)::R1(F)
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