MESON Chess Problem Database

Problem Display
PID: 138800 (5K1Q/pp6/r1b2p2/b1P1k3/3R4/4P2B/1B3rp1/8 w - - 0 1)

Shanshin, Valery Yurevich

1st HM., Hirschenson JT, 2010

5K1Q/pp6/r1b2p2/b1P1k3/3R4/4P2B/1B3rp1/8

#2

7 + 9

145 StrateGems 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Rf4
      • 2.exf4#
  • Tries
    • 1.Qh5+?
      • 1...Rf5
        • 2.Qxf5#
      • 1...f5!
    • 1.Qg8?
      • threat
        • 2.Qe6#
      • 1...Rf5
        • 2.Rb4#
      • 1...Bf3
        • 2.Qg3#
      • 1...Ba4
        • 2.Qd5#
      • 1...Be4
        • 2.Rd5#
      • 1...Bb5
        • 2.Qd5#
      • 1...Bd5
        • 2.Qxd5#
      • 1...Bd7
        • 2.Qd5#
      • 1...Be8
        • 2.Qd5#
      • 1...f5!
  • Keys
    • 1.Qh7!
      • threat
        • 2.Qe7#
      • 1...Bd8
        • 2.Rd2#
      • 1...Bf3
        • 2.Qf5#
      • 1...Ba4
        • 2.Qe4#
      • 1...Be4
        • 2.Qxe4#
      • 1...Bb5
        • 2.Qe4#
      • 1...Bd5
        • 2.Re4#
      • 1...Bd7
        • 2.Qe4#
      • 1...Be8
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • R(a);OGATE::P(B),XR(a)
  • Tries
    • Try
      • Q(G);CHECK,N_PINP(g)
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAR1(G),XR(a)
      • Refutation
        • P(g);P_SPINP(g)
    • Try
      • Q(G);N_PINP(g)
      • Threat
        • QAR1(G)
      • Vars
        • R(a);N_GUARD::B(A)+R(D)
        • B(f);S_CUTR(a)::QAB(G)
        • B(f);N_GUARD::QAR1(G)
        • B(f);SBLOCK::B(A)+R(D),DCHECK
        • B(f);N_GUARD::QAR1(G),XB(f)
      • Refutation
        • P(g);
  • Actual
    • Q(G);N_PINP(g)
    • Threat
      • QAR2(G)
    • Vars
      • B(c);N_GUARD::B(A)+R(D)
      • B(f);S_CUTR(a)::QAR1(G)
      • B(f);N_GUARD::QAR1(G)
      • B(f);N_GUARD::QAR1(G),XB(f)
      • B(f);SBLOCK::B(A)+R(D),DCHECK
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