MESON Chess Problem Database

Problem Display
PID: 26000 (8/7B/7p/4NR1Q/1P1P1P2/1P1N2p1/KBkp1pR1/7n w - - 0 1)

White, Alain Campbell

HM., American Chess Bulletin, 1951

8/7B/7p/4NR1Q/1P1P1P2/1P1N2p1/KBkp1pR1/7n

#2

12 + 6

81 Chess 1951
45 Schach 1952
3105 FIDE Album (1945-1955) 1964
56 The Problemist 2001

SOLUTION

  • SOUND
  • Sets
    • 1...d1S
      • 2.Qe2#
    • 1...f1S
      • 2.Se1#
    • 1...f1B
      • 2.Se1#
  • Tries
    • 1.Sxf2?
      • threat
        • 2.Rg5#
        • 2.Rf6#
        • 2.Rf7#
        • 2.Rf8#
        • 2.Qd1#
      • 1...gxf2
        • 2.Rfg5#
        • 2.Rf6#
        • 2.Rf7#
        • 2.Rf8#
      • 1...d1Q
        • 2.Qxd1#
      • 1...d1S
        • 2.Qxd1#
        • 2.Qe2#
      • 1...d1B
        • 2.Qxd1#
      • 1...d1R
        • 2.Qxd1#
      • 1...Sxf2!
    • 1.Qe2?
      • 1...f1Q
        • 2.Qxd2#
      • 1...f1S
        • 2.Se1#
      • 1...f1B
        • 2.Se1#
        • 2.Qxd2#
      • 1...f1R
        • 2.Qxd2#
      • 1...h5!
  • Keys
    • 1.Sf3!
      • 1...Kd1
        • 2.Sfe1#
      • 1...Kxd3
        • 2.Re5#
      • 1...d1Q
        • 2.Rc5#
      • 1...d1S
        • 2.Sde1#
      • 1...d1B
        • 2.Sde1#
        • 2.Rc5#
      • 1...d1R
        • 2.Rc5#
      • 1...f1Q
        • 2.Rxd2#
      • 1...f1S
        • 2.Sfe1#
      • 1...f1B
        • 2.Sfe1#
        • 2.Rxd2#
      • 1...f1R
        • 2.Rxd2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • P(c);OGATEB,P_SPINP(d)::QAR2(K)
    • P(d);N_GUARD,P_SPINP(c)::S(E)
  • Tries
    • Try
      • S(E);XP(d)
      • Threat
        • DUALS(5)
      • Vars
        • P(c);::QAB1(K),XQ(c)
        • P(c);::QAB1(K),XB(c)
        • P(c);::QAB1(K),XR(c)
      • Refutation
        • S(a);XS(E)
    • Try
      • Q(K);P_PINP(c)
      • Vars
        • P(d);::QAR1(K),XP(c)
        • P(d);N_GUARD::S(E)
      • Refutation
        • P(f);
  • Actual
    • S(I);
    • Vars
      • K(b);S_FLIGHT::QAB(K)+S(I)
      • K(b);OGATEB,S_FLIGHT,XS(E)::B(L)+R(J)
      • P(c);P_SPINP(d),SBLOCK::R(J)
      • P(c);N_GUARD,P_SPINP(d),SBLOCK::S(E)
      • P(d);OGATE,P_SPINP(c)::R1(C),XP(c)
      • P(d);N_GUARD,P_SPINP(c)::S(I)
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