MESON Chess Problem Database

Problem Display
PID: 238900 (1N6/4n1Qr/1N1p4/2k5/2q4r/P1p1P2p/2R1B3/1RK5 w - - 0 1)

Petite, Efren

Schach, 1955

1N6/4n1Qr/1N1p4/2k5/2q4r/P1p1P2p/2R1B3/1RK5

#2

9 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Rb5#
    • 1...Qb5
      • 2.Rxb5#
    • 1...Qd5
      • 2.S6d7#
      • 2.Rb5#
    • 1...Qe6
      • 2.Rb5#
    • 1...Qf7
      • 2.Rb5#
    • 1...Qg8
      • 2.Rb5#
    • 1...Qd4
      • 2.Rb5#
    • 1...Qe4
      • 2.Rb5#
    • 1...Qf4
      • 2.Rb5#
    • 1...Qg4
      • 2.Rb5#
    • 1...Sd5
      • 2.S6d7#
    • 1...Sc6
      • 2.S8d7#
  • Tries
    • 1.Qd4+?
      • 1...Qxd4
        • 2.Rb5#
      • 1...Rxd4!
  • Keys
    • 1.Qxc3!
      • threat
        • 2.Qb4#
        • 2.Qa5#
      • 1...Qxc3
        • 2.Rb5#
      • 1...d5
        • 2.Qb4#
      • 1...Sd5
        • 2.Sa4#
        • 2.Qa5#
      • 1...Sc6
        • 2.Sa6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 10
  • Sets
    • Q(c);N_GUARD,P_SPINP(a)::R1(A)
    • Q(c);N_GUARD,P_SPINP(a)::R1(A),XQ(c)
    • Q(c);N_GUARD,P_PINP(F),P_SPINP(a)::R1(A)
    • S(g);SBLOCK::S(G)
    • S(g);SBLOCK::S(I)
  • Tries
    • Try
      • Q(H);CHECK
      • Vars
        • Q(c);P_SPINP(a),XQ(H)::R1(A)
      • Refutation
        • R(d);XQ(H)
  • Actual
    • Q(H);P_PINQ(c),XP(a)
    • Threat
      • DUALS(2)
    • Vars
      • Q(c);P_PINR(C),XQ(H)::R1(A)
      • P(f);::QAB1(H)
      • S(g);SBLOCK::S(I)
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