MESON Chess Problem Database

Problem Display
PID: 229679 (2b2K2/1Bp2P2/3n2R1/r3kP1p/1B2N1P1/p5P1/2NP1R2/q4n1Q w - - 0 1)

Conway-Poole, IM

Sunday Chronicle, 1948

(First published on Sun Jan 4 1948)

2b2K2/1Bp2P2/3n2R1/r3kP1p/1B2N1P1/p5P1/2NP1R2/q4n1Q

#2

13 + 9

15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qc3
      • 2.Bxc3#
    • 1...Qb1
      • 2.Bc3#
      • 2.d4#
    • 1...Qc1
      • 2.Bc3#
      • 2.d4#
    • 1...Qd1
      • 2.Bc3#
    • 1...Qe1
      • 2.Bc3#
      • 2.d4#
    • 1...Qa2
      • 2.Bc3#
      • 2.d4#
    • 1...Be6
      • 2.Rxe6#
    • 1...Sxd2
      • 2.Qxa1#
    • 1...Sh2
      • 2.Qxa1#
    • 1...Se3
      • 2.Qxa1#
    • 1...Sxg3
      • 2.Qxa1#
    • 1...Sxe4
      • 2.Qxe4#
    • 1...hxg4
      • 2.Qh8#
  • Tries
    • 1.Sxd6?
      • threat
        • 2.Sc4#
        • 2.Qe4#
      • 1...Bxf5
        • 2.Sc4#
        • 2.Rxf5#
      • 1...Bxb7
        • 2.Sc4#
        • 2.Re6#
      • 1...Sxd2
        • 2.Qxa1#
      • 1...Sxg3
        • 2.Sc4#
        • 2.Qxa1#
      • 1...cxd6
        • 2.Bxd6#
        • 2.Qe4#
      • 1...Qc3
        • 2.Bxc3#
        • 2.Qe4#
      • 1...Qe1
        • 2.Sc4#
        • 2.Bc3#
        • 2.d4#
      • 1...Qa2
        • 2.Bc3#
        • 2.Qe4#
        • 2.d4#
      • 1...Rc5
        • 2.Qe4#
      • 1...Be6
        • 2.Rxe6#
        • 2.Qe4#
      • 1...Se3
        • 2.Qe4#
        • 2.Qxa1#
      • 1...Qd4!
  • Keys
    • 1.Sg5!
      • threat
        • 2.Sf3#
      • 1...Bxb7
        • 2.Re6#
      • 1...Sxd2
        • 2.Qxa1#
      • 1...Sxg3
        • 2.Qxa1#
      • 1...Sxb7
        • 2.Qe4#
      • 1...hxg4
        • 2.Qh8#
      • 1...Qc3
        • 2.Bxc3#
      • 1...Qd1
        • 2.Bc3#
      • 1...Rd5
        • 2.Qxd5#
      • 1...Sh2
        • 2.Qxa1#
      • 1...c6
        • 2.Bxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • Q(a);N_GUARD::B(F),XQ(a)
    • Q(a);N_GUARD::B(F)
    • B(i);N_GUARD::R1(J),XB(i)
    • S(b);OGATE,XP(C)::QAB(A),XQ(a)
    • S(b);OGATE::QAB(A),XQ(a)
    • S(b);OGATE,XP(E)::QAB(A),XQ(a)
    • S(g);OGATE,XS(G)::QAR1(A),XS(g)
    • P(f);OGATE,XP(H)::QAB(A)
  • Tries
    • Try
      • S(G);XS(g)
      • Threat
        • DUALS(2)
      • Vars
        • S(b);OGATE,XP(C)::QAB(A),XQ(a)
        • R(d);::QAR1(A)
      • Refutation
        • Q(a);
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • B(i);N_GUARD,XB(K)::R1(J)
      • S(b);OGATE,XP(C)::QAB(A),XQ(a)
      • S(b);OGATE,XP(E)::QAB(A),XQ(a)
      • S(g);N_GUARD,XB(K)::QAR1(A)
      • P(f);OGATE,XP(H)::QAB(A)
      • Q(a);N_GUARD::B(F),XQ(a)
      • Q(a);N_GUARD::B(F)
      • R(d);N_GUARD::QAR1(A),XR(d)
      • S(b);OGATE::QAB(A),XQ(a)
      • P(h);N_GUARD::B(F),XS(g)
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