MESON Chess Problem Database

Problem Display
PID: 176244 (qR6/Rn4r1/2pQ4/n1B5/2p4P/7p/3N2kN/1K5b w - - 0 1)

Gross, Erwin

Schach-Echo, 1971

qR6/Rn4r1/2pQ4/n1B5/2p4P/7p/3N2kN/1K5b

#2

8 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sd8
      • 2.Rxg7#
  • Tries
    • 1.Shf1?
      • threat
        • 2.Qh2#
      • 1...Sxd6
        • 2.Rxg7#
      • 1...h2
        • 2.Qxh2#
      • 1...Rg3
        • 2.Qxg3#
      • 1...Qxb8!
    • 1.Shf3?
      • threat
        • 2.Se1#
        • 2.Qh2#
      • 1...Qxb8
        • 2.Se1#
      • 1...Sxc5
        • 2.Qh2#
      • 1...Sxd6
        • 2.Rxg7#
      • 1...h2
        • 2.Qxh2#
      • 1...Re7
        • 2.Qh2#
        • 2.Qg6#
      • 1...Rg3!
    • 1.Qf4?
      • threat
        • 2.Qf2#
      • 1...Sxc5
        • 2.Rxg7#
      • 1...Rf7!
    • 1.Qg6+?
      • 1...Kxh2
        • 2.Sf1#
        • 2.Bg1#
      • 1...Rxg6!
  • Keys
    • 1.Sdf3!
      • threat
        • 2.Se1#
      • 1...Sxc5
        • 2.Rb2#
      • 1...Sxd6
        • 2.Rxg7#
      • 1...Rg3
        • 2.Qd2#
      • 1...Re7
        • 2.Qg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • S(g);OGATE::R(G),XR(h)
  • Tries
    • Try
      • S(C);
      • Threat
        • QAR1(F)
      • Vars
        • S(g);OGATE,XQ(F)::R(G),XR(h)
        • P(c);::QAR1(F),XP(c)
        • R(h);N_GUARD::QAR1(F),XR(h)
      • Refutation
        • Q(i);XR(H)
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • Q(i);XR(H)::S(C)
        • S(g);XB(E)::QAR1(F)
        • S(g);OGATE,XQ(F)::R(G),XR(h)
        • P(c);::QAR1(F),XP(c)
      • Refutation
        • R(h);
    • Try
      • Q(F);
      • Threat
        • QAR1(F)
      • Vars
        • S(g);OGATE,XB(E)::R(G),XR(h)
      • Refutation
        • R(h);
    • Try
      • Q(F);CHECK
      • Refutation
        • R(h);XQ(F)
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • S(g);OGATE,XB(E)::R(H)
      • S(g);OGATE,XQ(F)::R(G),XR(h)
      • R(h);SBLOCK::QAR(F)
      • R(h);N_GUARD::QAR(F)
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