MESON Chess Problem Database

Problem Display
PID: 121628 (2R1K3/n1p2N2/2k2b2/2ppp3/3BP3/1R4Q1/8/8 w - - 0 1)

Steel, William M

Chess, 1956

2R1K3/n1p2N2/2k2b2/2ppp3/3BP3/1R4Q1/8/8

#2

7 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...c4
      • 2.Rb6#
    • 1...exd4
      • 2.Rxc7#
      • 2.Qd6#
      • 2.Qxc7#
  • Tries
    • 1.Qg2?
      • threat
        • 2.exd5#
      • 1...cxd4
        • 2.Qc2#
      • 1...dxe4
        • 2.Qxe4#
      • 1...Sb5!
  • Keys
    • 1.Qd3!
      • threat
        • 2.Qa6#
      • 1...Sxc8
        • 2.Qb5#
      • 1...cxd4
        • 2.Qc2#
      • 1...dxe4
        • 2.Qxe4#
      • 1...Sb5
        • 2.Qxb5#
      • 1...c4
        • 2.Rb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(a);::R1(A)
  • Tries
    • Try
      • Q(B);
      • Threat
        • P(D),XP(b)
      • Vars
        • P(a);OGATEB,XB(C)::QAR(B)
        • P(b);N_SPINP(g),OGATE,P_SPINP(b),XP(D)::QAB(B),XP(b)
      • Refutation
        • S(f);
  • Actual
    • Q(B);
    • Threat
      • QAR2(B)
    • Vars
      • S(f);N_GUARD,N_SPINP(g),XR(F)::QAB1(B)
      • P(a);OGATEB,XB(C)::QAR(B)
      • P(b);OGATE,XP(D)::QAB(B),XP(b)
      • S(f);N_GUARD::QAB1(B),XS(f)
      • P(a);::R1(A)
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