MESON Chess Problem Database

Problem Display
PID: 227405 (nQ2N1Kn/1Br1b3/p5p1/r1RR1p2/2b1kP2/1q3pP1/1pP2B2/3N4 w - - 0 1)

Whitehead, Cyril

Sunday Chronicle, 1947

(First published on Sat Mar 22 1947)

nQ2N1Kn/1Br1b3/p5p1/r1RR1p2/2b1kP2/1q3pP1/1pP2B2/3N4

#2

11 + 13

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Sc3#
    • 1...Qa4
      • 2.Sc3#
    • 1...Qc3
      • 2.Sxc3#
    • 1...Qb5
      • 2.Sc3#
    • 1...Qb6
      • 2.Sc3#
    • 1...Qxb7
      • 2.Sc3#
    • 1...Rxc5
      • 2.Qe5#
    • 1...Rc6
      • 2.Qe5#
    • 1...Rxb7
      • 2.Qe5#
    • 1...Rd7
      • 2.Qe5#
    • 1...Rc8
      • 2.Qe5#
    • 1...Bh4
      • 2.Sd6#
    • 1...Bxc5
      • 2.Sf6#
    • 1...Bg5
      • 2.Sd6#
    • 1...Bd6
      • 2.Sxd6#
      • 2.Sf6#
    • 1...Bf6
      • 2.Sd6#
      • 2.Sxf6#
    • 1...Bd8
      • 2.Sd6#
    • 1...Bf8
      • 2.Sf6#
    • 1...Sf7
      • 2.Rd4#
      • 2.Re5#
  • Tries
    • 1.Rxc4+?
      • 1...Rxc4
        • 2.Rd4#
        • 2.Re5#
        • 2.Qe5#
      • 1...Qxc4!
  • Keys
    • 1.Rc6!
      • threat
        • 2.Re6#
      • 1...Kxd5
        • 2.Rd6#
      • 1...Qxb7
        • 2.Sc3#
      • 1...Rxc6
        • 2.Qe5#
      • 1...Rxb7
        • 2.Qe5#
      • 1...Qc3
        • 2.Sxc3#
      • 1...Qb6
        • 2.Sc3#
      • 1...Bd6
        • 2.Sf6#
      • 1...Bf6
        • 2.Sxf6#
      • 1...Sf7
        • 2.Rd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 11
  • Sets
    • Q(b);N_GUARD::S(A)
    • Q(b);N_GUARD::S(A),XQ(b)
    • Q(b);N_GUARD,XB(H)::S(A)
    • R(j);OGATE,XR(F)::QAR1(I)
    • R(j);OGATE::QAR1(I)
    • R(j);OGATE,XB(H)::QAR1(I)
    • R(j);OGATE,P_PINS(J)::QAR1(I)
    • B(k);N_GUARD::S(J)
    • B(k);N_GUARD,XR(F)::S(J)
  • Tries
    • Try
      • R(F);CHECK,N_SPINR(G),XB(d)
      • Refutation
        • Q(b);P_PINR(G),XR(F)
  • Actual
    • R(F);
    • Threat
      • R(F)
    • Vars
      • K(e);OGATEB,S_FLIGHT,XR(G)::B(H)+R(F),DCHECK
      • Q(b);N_GUARD,XB(H)::S(A)
      • R(j);OGATE,XR(F)::QAR1(I)
      • R(j);OGATE,XB(H)::QAR1(I)
      • Q(b);N_GUARD::S(A),XQ(b)
      • Q(b);N_GUARD::S(A)
      • B(k);N_GUARD::S(J)
      • B(k);N_GUARD::S(J),XB(k)
      • S(m);N_PINR(G)::R1(G)
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