MESON Chess Problem Database

Problem Display
PID: 52431 (4n1n1/3K1N2/5p1p/R3qk2/6R1/2QP1P2/p1B5/bb1r4 w - - 0 1)

Barclay, William A

American Chess Bulletin, 1960

4n1n1/3K1N2/5p1p/R3qk2/6R1/2QP1P2/p1B5/bb1r4

#2

8 + 10

5064 100 Years of the American Two-move Chess Problem 1962

SOLUTION

  • SOUND
  • Sets
    • 1...Qb5+
      • 2.Rxb5#
    • 1...Qc5
      • 2.Rxc5#
    • 1...Qd5+
      • 2.Rxd5#
    • 1...Rxd3+
      • 2.Qxd3#
    • 1...Sd6
      • 2.Sxd6#
    • 1...Sc7
      • 2.Sd6#
    • 1...Sg7
      • 2.Sd6#
    • 1...Se7
      • 2.Sxh6#
  • Tries
    • 1.Bb3?
      • threat
        • 2.Be6#
      • 1...Qb5+
        • 2.Rxb5#
      • 1...Qd5+
        • 2.Rxd5#
      • 1...Sc7
        • 2.Sd6#
      • 1...Sg7
        • 2.Sd6#
      • 1...Rxd3+!
    • 1.Qd4?
      • threat
        • 2.Qe4#
        • 2.Qf4#
      • 1...Qb5+
        • 2.Rxb5#
      • 1...Qd5+
        • 2.Rxd5#
      • 1...Rxd3
        • 2.Qxd3#
      • 1...Re1
        • 2.Qf4#
      • 1...Sd6
        • 2.Sxd6#
        • 2.Qf4#
      • 1...Bxd4!
    • 1.d4+?
      • 1...Rd3
        • 2.Qxd3#
      • 1...Bxc2!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Kc6#
        • 2.Kd8#
      • 1...Qb5+
        • 2.Kd8#
      • 1...Qd5+
        • 2.Kxe8#
      • 1...Rxd3+
        • 2.Kc6#
      • 1...Qxa5
        • 2.Kc6#
        • 2.Kxe8#
      • 1...Qc5
        • 2.Kd8#
        • 2.Kxe8#
      • 1...Sd6
        • 2.Sxd6#
      • 1...Sc7
        • 2.Sd6#
      • 1...Sg7
        • 2.Sd6#
      • 1...Se7
        • 2.Sxh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • Q(e);CHECK,OGATEB::R(F),XQ(e)
    • Q(e);OGATEB::R(F),XQ(e)
    • Q(e);CHECK,N_PINP(C),OGATEB::R(F),XQ(e)
    • R(c);CHECK,OGATE,P_SPINR(c),XP(C)::QAB(B),XR(c)
    • S(i);N_GUARD,N_PINP(C)::S(H),XS(i)
    • S(i);N_GUARD::S(H)
    • S(j);N_GUARD::S(H),XP(h)
  • Tries
    • Try
      • B(A);
      • Threat
        • B(A)
      • Vars
        • Q(e);CHECK,OGATEB::R(F),XQ(e)
        • Q(e);CHECK,N_PINP(C),OGATEB::R(F),XQ(e)
        • S(i);N_GUARD::S(H)
      • Refutation
        • R(c);CHECK,XP(C)
    • Try
      • Q(B);N_SPINP(C)
      • Threat
        • DUALS(2)
      • Vars
        • Q(e);CHECK,OGATEB::R(F),XQ(e)
        • R(c);OGATE,P_PINQ(B),P_SPINR(c),XP(C)::QAB(B),XR(c)
        • R(c);::QAR1(B)
      • Refutation
        • B(a);XQ(B)
    • Try
      • P(C);CHECK
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::QAB(B),XR(c)
      • Refutation
        • B(b);XB(A)
  • Actual
    • Q(B);
    • Threat
      • DUALS(2)
    • Vars
      • Q(e);CHECK::QAB(B)+K(G)
      • Q(e);CHECK,N_PINP(C)::QAB(B)+K(G),XS(i)
      • R(c);CHECK,P_SPINR(c),XP(C)::QAB(B)+K(G)
      • S(i);N_GUARD,N_PINP(C)::S(H),XS(i)
      • S(i);N_GUARD::S(H)
      • S(j);N_GUARD::S(H),XP(h)
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