MESON Chess Problem Database

Problem Display
PID: 166295 (1r6/1PPnpq2/2R1b2R/Np1Nkp2/5p2/B4P2/3QK3/b7 w - - 0 1)

Shanshin, Valery Yurevich

1st HM., StrateGems, 2016

1r6/1PPnpq2/2R1b2R/Np1Nkp2/5p2/B4P2/3QK3/b7

#2

10 + 10

145 StrateGems 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Qh5
      • 2.Rcxe6#
      • 2.Rhxe6#
    • 1...Qe8
      • 2.Rcxe6#
      • 2.Rhxe6#
    • 1...Qg7
      • 2.Rcxe6#
      • 2.Rhxe6#
    • 1...Qh7
      • 2.Rcxe6#
      • 2.Rhxe6#
    • 1...Qf8
      • 2.Rcxe6#
      • 2.Rhxe6#
    • 1...Bb2
      • 2.Bxb2#
    • 1...Sc5
      • 2.cxb8Q#
      • 2.cxb8B#
    • 1...Sb6
      • 2.cxb8Q#
      • 2.cxb8B#
    • 1...Sf6
      • 2.cxb8Q#
      • 2.cxb8B#
    • 1...Sf8
      • 2.cxb8Q#
      • 2.cxb8B#
    • 1...b4
      • 2.Sc4#
  • Tries
    • 1.Rc3?
      • threat
        • 2.Sc6#
      • 1...Sc5
        • 2.cxb8Q#
        • 2.cxb8B#
      • 1...b4
        • 2.Sc4#
      • 1...Bxd5!
    • 1.Rc4?
      • threat
        • 2.Sc6#
      • 1...Bxd5
        • 2.Qxf4#
      • 1...Bd4
        • 2.Qxd4#
      • 1...Sc5
        • 2.cxb8Q#
        • 2.cxb8B#
      • 1...b4!
    • 1.Rd6?
      • threat
        • 2.Sc6#
        • 2.Qxf4#
      • 1...exd6
        • 2.Sc6#
      • 1...Sc5
        • 2.Qxf4#
      • 1...b4
        • 2.Sc4#
        • 2.Qxf4#
      • 1...Bxd5!
  • Keys
    • 1.Rc5!
      • threat
        • 2.Qxf4#
      • 1...Kd6
        • 2.Sc3#
      • 1...Bxd5
        • 2.Sc6#
      • 1...Sxc5
        • 2.cxb8Q#
        • 2.cxb8B#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • B(a);N_GUARD::B(C),XB(a)
    • S(g);N_GUARD::PXR(j)=Q
    • P(c);N_GUARD::S(E)
  • Tries
    • Try
      • R(G);
      • Threat
        • S(E)
      • Vars
        • S(g);N_GUARD::PXR(j)=Q
        • P(c);N_GUARD::S(E)
      • Refutation
        • B(f);XS(F)
    • Try
      • R(G);
      • Threat
        • S(E)
      • Vars
        • B(f);SBLOCK,XS(F)::QAB1(A),XP(b)
        • B(a);N_GUARD::QAB1(A),XB(a)
        • S(g);N_GUARD::PXR(j)=Q
      • Refutation
        • P(c);
    • Try
      • R(G);
      • Threat
        • DUALS(2)
      • Vars
        • P(h);XR(G)::S(E)
        • S(g);::QAB1(A),XP(b)
      • Refutation
        • B(f);XS(F)
  • Actual
    • R(G);
    • Threat
      • QAB1(A),XP(b)
    • Vars
      • K(d);P_SPINB(f),S_FLIGHT::QAR(A)+S(F)
      • B(f);P_SPINB(f),XS(F)::S(E)
      • S(g);N_GUARD,XR(G)::PXR(j)=Q
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