MESON Chess Problem Database

Problem Display
PID: 257937 (k5bR/N2p4/Kp1B4/1Pp3rp/1p2qb2/4pQn1/8/R7 w - - 0 1)

Marjenstras, Z

British Chess Magazine, 1934

k5bR/N2p4/Kp1B4/1Pp3rp/1p2qb2/4pQn1/8/R7

#2

7 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qb7+
      • 2.Qxb7#
    • 1...Be5
      • 2.Qf8#
    • 1...Sf5
      • 2.Qxe4#
  • Tries
    • 1.Sc8?
      • threat
        • 2.Sxb6#
      • 1...Qb7+
        • 2.Qxb7#
      • 1...Bxd6!
    • 1.Qxe4+?
      • 1...Rd5
        • 2.Rxg8#
        • 2.Qxd5#
        • 2.Qe8#
      • 1...Sxe4!
  • Keys
    • 1.Kxb6!
      • threat
        • 2.Sc6#
      • 1...Qc6+
        • 2.Sxc6#
      • 1...Qb7+
        • 2.Qxb7#
      • 1...Qd5
        • 2.Sc8#
      • 1...Be5
        • 2.Qf8#
      • 1...b3
        • 2.Sc8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(d);CHECK,OGATE::QAB1(B),XQ(d)
    • B(e);OGATE::QAR(B)
    • S(b);N_GUARD,S_CUTR(g)::QAB(B),XQ(d)
  • Tries
    • Try
      • S(F);N_PINB(l)
      • Threat
        • S(F),XP(i)
      • Vars
        • Q(d);CHECK,OGATE::QAB1(B),XQ(d)
      • Refutation
        • B(e);XB(E)
    • Try
      • Q(B);CHECK,XQ(d)
      • Refutation
        • S(b);XQ(B)
  • Actual
    • K(D);P-FLIGHT,XP(i)
    • Threat
      • R(A)+S(F)
    • Vars
      • Q(d);CHECK::R(A)+S(F),XQ(d)
      • Q(d);CHECK,OGATE::QAB1(B),XQ(d)
      • Q(d);::R(A)+S(F)
      • B(e);OGATE::QAR(B)
      • P(c);::R(A)+S(F)
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Developed and maintained by Brian Stephenson.
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