MESON Chess Problem Database

Problem Display
PID: 53210 (2N4K/2p2B1b/5Q2/1pkP1n1R/1p6/r1qP1N2/5b2/2R5 w - - 0 1)

Marshall, Burney Means

HM., American Chess Bulletin, 1939

2N4K/2p2B1b/5Q2/1pkP1n1R/1p6/r1qP1N2/5b2/2R5

#2

9 + 9

268 Chess Life 2004

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc1
      • 2.Qc6#
    • 1...Qc2
      • 2.Qc6#
    • 1...Qc4
      • 2.Qc6#
    • 1...Se3
      • 2.Qd4#
    • 1...Sd4
      • 2.Qe7#
    • 1...Sg7
      • 2.Qe7#
      • 2.Qc6#
    • 1...b3
      • 2.Qxc3#
  • Tries
    • 1.Rxc3+?
      • 1...Rxc3
        • 2.Qc6#
      • 1...bxc3!
  • Keys
    • 1.Sg5!
      • threat
        • 2.Se4#
      • 1...b3
        • 2.Qxc3#
      • 1...Se3
        • 2.Se6#
      • 1...Sg3
        • 2.Se6#
      • 1...Sd4
        • 2.Qe7#
      • 1...Sh4
        • 2.Se6#
      • 1...Sd6
        • 2.Se6#
      • 1...Sh6
        • 2.Se6#
      • 1...Se7
        • 2.Se6#
      • 1...Sg7
        • 2.Qxf2#

This is a version

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 3
  • Sets
    • Q(c);N_PINQ(F),N_SPINQ(c),XR(A)::QAR1(F)
    • Q(c);N_PINQ(F)::QAR1(F)
    • S(g);N_GUARD,S_CUTB(a)::QAB1(F)
    • S(g);N_PINQ(F)::QAB(F)
    • P(d);N_GUARD,S_CUTR(b)::QAR2(F),XQ(c)
  • Tries
    • Try
      • R(A);CHECK,N_SPINQ(F),XQ(c)
      • Vars
        • R(b);XR(A)::QAR1(F)
      • Refutation
        • P(d);XR(A)
  • Actual
    • S(C);
    • Threat
      • S(C)
    • Vars
      • P(d);N_GUARD,S_CUTR(b)::QAR2(F),XQ(c)
      • S(g);::S(C)
      • S(g);N_PINQ(F),SBLOCK::QAB(F)
      • S(g);N_PINQ(F)::QAB(F),XB(a)
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