MESON Chess Problem Database

Problem Display
PID: 224147 (4N1b1/2rB2pq/1br4p/n2N3R/1B2k1pP/4P1R1/KP1Q4/4n3 w - - 0 1)

Shannon, J

Sunday Chronicle, 1944

(First published on Sun Jul 9 1944)

4N1b1/2rB2pq/1br4p/n2N3R/1B2k1pP/4P1R1/KP1Q4/4n3

#2

11 + 11

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rc1
      • 2.Sd6#
    • 1...Rc2
      • 2.Sd6#
    • 1...Rc3
      • 2.Sd6#
    • 1...Rc4
      • 2.Sd6#
    • 1...Rc5
      • 2.Sd6#
      • 2.Qd4#
    • 1...Rd6
      • 2.Sxd6#
    • 1...Bxe3
      • 2.Rxe3#
      • 2.Qxe3#
    • 1...Bd4
      • 2.Qxd4#
    • 1...Bxd5+
      • 2.Qxd5#
    • 1...Sd3
      • 2.Qg2#
    • 1...Sf3
      • 2.Rxg4#
    • 1...Sc4
      • 2.Sc3#
  • Tries
    • 1.Bc5?
      • threat
        • 2.Qd4#
      • 1...Bxd5+
        • 2.Qxd5#
      • 1...Sc2
        • 2.Qxc2#
      • 1...Sd3
        • 2.Qg2#
      • 1...Sf3
        • 2.Rxg4#
        • 2.Qc2#
      • 1...Sb3
        • 2.Sc3#
      • 1...Bxc5!
  • Keys
    • 1.Bd6!
      • threat
        • 2.Re5#
      • 1...Bxd5+
        • 2.Qxd5#
      • 1...Rxd6
        • 2.Sxd6#
      • 1...Qf5
        • 2.Bxf5#
      • 1...Bd4
        • 2.Qxd4#
      • 1...Sd3
        • 2.Qg2#
      • 1...Sf3
        • 2.Rxg4#
      • 1...Sc4
        • 2.Sc3#
      • 1...g5
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • R(f);N_GUARD::S(K)
    • R(f);N_GUARD,P_PINP(B)::S(K)
    • R(f);N_GUARD,N_PINS(H)::S(K)
    • R(f);N_GUARD::S(K),XR(f)
    • B(e);N_GUARD::QAR1(C),XB(e)
    • B(k);CHECK,OGATE,XS(H)::QAB1(C),XB(k)
    • S(a);N_GUARD,SBLOCK::QAB(C)
    • S(a);SBLOCK::R(E),XP(c)
    • S(d);N_PINS(H)::S(H)
  • Tries
    • Try
      • B(F);
      • Threat
        • QAR1(C)
      • Vars
        • B(k);CHECK,OGATE,XS(H)::QAB1(C),XB(k)
        • S(a);N_GUARD::QAB(C),XS(a)
        • S(a);N_GUARD,SBLOCK::QAB(C)
        • S(d);N_PINS(H)::S(H)
      • Refutation
        • B(e);XB(F)
  • Actual
    • B(F);
    • Threat
      • R1(I)
    • Vars
      • B(k);CHECK,OGATE,XS(H)::QAB1(C),XB(k)
      • R(f);XB(F)::S(K),XR(f)
      • Q(j);N_GUARD::B(J),XQ(j)
      • B(e);N_GUARD::QAR1(C),XB(e)
      • S(a);N_GUARD,SBLOCK::QAB(C)
      • S(a);SBLOCK::R(E),XP(c)
      • S(d);N_PINS(H)::S(H)
      • P(i);N_GUARD::S(K)
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