MESON Chess Problem Database

Problem Display
PID: 266421 (3N4/3pp3/6B1/N1p1k1P1/3qPp2/n4R1K/1Q6/8 w - - 0 1)

McCarthy, EJ

Sunday Referee, 1937

(First published on Sun Jul 11 1937)

3N4/3pp3/6B1/N1p1k1P1/3qPp2/n4R1K/1Q6/8

#2

8 + 7

3713 Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.Qb8#
    • 1...Sb1
      • 2.Sc4#
    • 1...Sc2
      • 2.Sc4#
    • 1...Sc4
      • 2.Sxc4#
    • 1...Sb5
      • 2.Sc4#
    • 1...d5
      • 2.Qb8#
    • 1...d6
      • 2.Sac6#
    • 1...e6
      • 2.Sf7#
  • Tries
    • 1.Sac6+?
      • 1...Kd6
        • 2.Qb8#
      • 1...dxc6!
    • 1.Qb8+?
      • 1...d6
        • 2.Sac6#
      • 1...Qd6!
  • Keys
    • 1.Rd3!
      • 1...Kd6
        • 2.Qb8#
      • 1...Qxb2
        • 2.Rd5#
      • 1...f3
        • 2.Qh2#
      • 1...Qc3
        • 2.Qxc3#
      • 1...Sb1
        • 2.Sc4#
      • 1...Sc2
        • 2.Sc4#
      • 1...Sc4
        • 2.Sxc4#
      • 1...Sb5
        • 2.Sc4#
      • 1...c4
        • 2.Qxd4#
      • 1...d5
        • 2.Qb8#
      • 1...d6
        • 2.Sac6#
      • 1...e6
        • 2.Sf7#

Anticipated by 57921(1883)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(e);N_SPINQ(b),S_CUTP(f),S_CUTQ(b),S_FLIGHT::QAB(A)
    • S(a);N_GUARD::S(E)
    • S(a);N_GUARD::S(E),XS(a)
    • P(f);N_GUARD::QAB(A)
    • P(f);N_GUARD,SBLOCK::S(E)
    • P(g);SBLOCK::S(H)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(e);N_SPINQ(b),S_FLIGHT::QAB(A)
      • Refutation
        • P(f);XS(E)
    • Try
      • Q(A);CHECK,N_PINQ(b)
      • Vars
        • P(f);P_SPINP(f)::S(E)
      • Refutation
        • Q(b);P_SPINQ(b)
  • Actual
    • R(B);
    • Vars
      • K(e);S_CUTP(f),S_FLIGHT::QAB(A)
      • Q(b);N_SPINQ(b),OGATE,XQ(A)::R1(B)
      • P(c);OGATEB::QAB(A)
      • Q(b);OGATEB,P_PINR(B)::QAB(A),XQ(b)
      • S(a);N_GUARD::S(E)
      • S(a);N_GUARD::S(E),XS(a)
      • P(d);N_GUARD::QAB1(A),XQ(b)
      • P(f);N_GUARD::QAB(A)
      • P(f);N_GUARD,SBLOCK::S(E)
      • P(g);SBLOCK::S(H)
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