MESON Chess Problem Database

Problem Display
PID: 151532 (4Q3/2K5/4p3/2pk2n1/8/R1Pp2N1/8/B4B2 w - - 0 1)

Rayner, James

Pen & Pencil, 1888

(First published on Sat Apr 7 1888)

4Q3/2K5/4p3/2pk2n1/8/R1Pp2N1/8/B4B2

#2

7 + 5

15239 Valois Notebooks 2014

SOLUTION

  • SOUND
  • Sets
    • 1...d2
      • 2.c4#
    • 1...c4
      • 2.Ra5#
      • 2.Qb5#
  • Tries
    • 1.Bxd3?
      • threat
        • 2.c4#
      • 1...c4
        • 2.Ra5#
        • 2.Qb5#
      • 1...Ke5!
    • 1.Ra4?
      • threat
        • 2.c4#
      • 1...c4
        • 2.Ra5#
        • 2.Qb5#
      • 1...Ke5!
    • 1.Qg6?
      • 1...Kc4
        • 2.Qxd3#
      • 1...Ke5
        • 2.Qxg5#
      • 1...Sf3
        • 2.Qe4#
      • 1...Sh3
        • 2.Qe4#
      • 1...Se4
        • 2.Qxe4#
      • 1...Sf7
        • 2.Qe4#
      • 1...Sh7
        • 2.Qe4#
      • 1...d2
        • 2.c4#
      • 1...c4
        • 2.Ra5#
      • 1...e5!
    • 1.Qd7+?
      • 1...Kc4
        • 2.Bxd3#
        • 2.Qxd3#
      • 1...Ke5!
  • Keys
    • 1.Qd8+!
      • 1...Kc4
        • 2.Bxd3#
        • 2.Qxd3#
      • 1...Ke5
        • 2.Qxg5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • P(a);::P(D)
  • Tries
    • Try
      • B(B);XP(a)
      • Threat
        • P(D)
      • Refutation
        • K(c);P-FLIGHT,P_SPINP(e)
    • Try
      • R(C);
      • Threat
        • P(D)
      • Refutation
        • K(c);P-FLIGHT,P_SPINP(e)
    • Try
      • Q(G);
      • Vars
        • K(c);P_SPINP(a),S_FLIGHT::QAB1(G),XP(a)
        • K(c);P-FLIGHT::QAR2(G),XS(d)
        • S(d);N_GUARD::QAB1(G)
        • S(d);N_GUARD::QAB1(G),XS(d)
        • P(a);::P(D)
        • P(b);OGATEB,SBLOCK::R(C)
      • Refutation
        • P(e);
    • Try
      • Q(G);CHECK
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • Q(G);CHECK
    • Vars
      • K(c);P-FLIGHT::QAR2(G),XS(d)
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