MESON Chess Problem Database

Problem Display
PID: 297 (BBN5/2n1P3/3r1p2/p3kP2/1N2b1P1/1QR1b1P1/K1P5/4R2q w - - 0 1)

Alvey, George Clarence Vincent

2nd Prize, The Observer, 1920

(First published on Sun Sep 19 1920)

BBN5/2n1P3/3r1p2/p3kP2/1N2b1P1/1QR1b1P1/K1P5/4R2q

#2

13 + 8

887 Mate in Two Moves 1931
56 The Problemist 1937
3174 The Two-move Chess Problem Tradition and Development 1966
56 The Problemist 2003
5293 A selection of chess problems by G. C. Alvey 2004
15148 Sadier Collection 2015
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rd4
      • 2.Qe6#
      • 2.e8Q#
      • 2.e8R#
    • 1...Rd5
      • 2.Sc6#
    • 1...Bd4
      • 2.Sd3#
    • 1...Sd5
      • 2.Sc6#
  • Tries
    • 1.Qd5+?
      • 1...Rxd5
        • 2.Sc6#
      • 1...Sxd5
        • 2.Sc6#
      • 1...Bxd5+!
  • Keys
    • 1.Qb2!
      • threat
        • 2.Rc5#
      • 1...Bd5+
        • 2.Rc4#
      • 1...Kd4
        • 2.Rc6#
        • 2.Rxc7#
      • 1...Bxf5
        • 2.Rcxe3#
      • 1...Bxa8
        • 2.Rcxe3#
      • 1...Bc6
        • 2.Rcxe3#
      • 1...Bb7
        • 2.Rcxe3#
      • 1...Rd4
        • 2.e8Q#
        • 2.e8R#
      • 1...Rd5
        • 2.Sc6#
      • 1...Bd4
        • 2.Sd3#
      • 1...Bc5
        • 2.Rxc5#
      • 1...Sd5
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • R(f);N_GUARD,P_SPINS(h),S_CUTB(c)::S(G)
    • B(b);P_SPINB(c),SBLOCK,S_CUTR(f)::S(G)
    • S(h);P_SPINR(f),S_CUTB(c)::S(G)
  • Tries
    • Try
      • Q(D);CHECK
      • Vars
        • R(f);P_SPINS(h),SBLOCK,XQ(D)::S(G)
        • S(h);P_SPINR(f),SBLOCK,XQ(D)::S(G)
      • Refutation
        • B(c);CHECK,P_SPINB(b),XQ(D)
  • Actual
    • Q(D);
    • Threat
      • QAB(D)+R(E),DCHECK
    • Vars
      • B(c);CHECK,P_SPINB(b),S_CUTR(f)::QAB(D)+R(E)
      • B(c);P_SPINB(b),XP(I)::QAB(D)+R(E),DCHECK,XB(b)
      • B(c);P_SPINB(b),XB(K)::QAB(D)+R(E),DCHECK,XB(b)
      • B(c);P_SPINB(b)::QAB(D)+R(E),DCHECK,XB(b)
      • R(f);N_GUARD,P_SPINS(h),SBLOCK::P=Q
      • R(f);N_GUARD,P_SPINS(h),SBLOCK,S_CUTB(c)::S(G)
      • B(b);P_SPINB(c),SBLOCK,S_CUTR(f)::S(G)
      • B(b);P_SPINB(c)::QAB(D)+R(E),DCHECK,XB(b)
      • S(h);P_SPINR(f),SBLOCK,S_CUTB(c)::S(G)
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