MESON Chess Problem Database

Problem Display
PID: 179727 (2N2K2/q3p3/R7/nQPkpPN1/4n2b/4P3/4Rp2/8 w - - 0 1)

Kopnin, Aleksey Grigorevich

Popkov, Nikolai Nikolaevich

3rd Prize, Podolsky rabochy, 1976

2N2K2/q3p3/R7/nQPkpPN1/4n2b/4P3/4Rp2/8

#2

9 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc5
      • 2.Sxe7#
    • 1...Qb6
      • 2.Sxb6#
      • 2.Sxe7#
    • 1...Qxa6
      • 2.Sxe7#
    • 1...Qd7
      • 2.Sb6#
    • 1...Sd2
      • 2.Rxd2#
    • 1...Sc3
      • 2.Rd2#
    • 1...Sg3
      • 2.Rd2#
    • 1...Sxc5
      • 2.Rd2#
    • 1...Sd6
      • 2.Rd2#
    • 1...Sf6
      • 2.Rd2#
    • 1...Sc4
      • 2.Qc6#
    • 1...Sb7
      • 2.Sxe7#
  • Tries
    • 1.Sxe4?
      • threat
        • 2.Sc3#
        • 2.Qd3#
      • 1...Qxc5
        • 2.Sc3#
      • 1...Qxa6
        • 2.Sc3#
      • 1...Qb6
        • 2.Sc3#
      • 1...Sb3
        • 2.Sc3#
      • 1...Sc4
        • 2.Sc3#
        • 2.Qc6#
      • 1...Sc6
        • 2.Sc3#
      • 1...Kxe4!
    • 1.Rd6+?
      • 1...Sxd6
        • 2.Rd2#
      • 1...exd6!
    • 1.Rxa7?
      • threat
        • 2.Sb6#
        • 2.Sxe7#
      • 1...Bxg5
        • 2.Sb6#
      • 1...Sxc5
        • 2.Rd2#
        • 2.Rd7#
      • 1...Sc4
        • 2.Sxe7#
      • 1...Sc6
        • 2.Sb6#
      • 1...e6
        • 2.Sb6#
        • 2.Se7#
      • 1...Sxg5!
    • 1.c6+?
      • 1...Sc5
        • 2.Rd2#
      • 1...Qc5!
  • Keys
    • 1.Se6!
      • threat
        • 2.Qd3#
      • 1...Qxc5
        • 2.Sc7#
      • 1...Qxa6
        • 2.Sc7#
      • 1...Sxc5
        • 2.e4#
      • 1...Qb6
        • 2.Sxb6#
      • 1...Sb3
        • 2.Qxb3#
      • 1...Sc4
        • 2.Qc6#
      • 1...Sc6
        • 2.Qb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • Q(g);N_GUARD,P_SPINQ(g),XP(D)::S(H),XP(h)
    • Q(g);N_GUARD,XR(G)::S(H),XP(h)
    • Q(g);N_GUARD::S(H)
    • S(b);N_GUARD::R(A),XS(b)
    • S(b);N_GUARD::R(A)
    • S(b);N_GUARD,P_SPINS(b),XP(D)::R(A)
    • S(d);N_GUARD,SBLOCK::QAB1(C)
    • S(d);S_CUTQ(g)::S(H),XP(h)
  • Tries
    • Try
      • S(F);XS(b)
      • Threat
        • DUALS(2)
      • Vars
        • Q(g);P_SPINQ(g),XP(D)::S(F)
        • Q(g);XR(G)::S(F)
        • Q(g);::S(F)
        • S(d);::S(F)
      • Refutation
        • K(e);S_FLIGHT,XS(F)
    • Try
      • R(G);CHECK
      • Vars
        • S(b);XR(G)::R(A)
      • Refutation
        • P(h);XR(G)
    • Try
      • R(G);XQ(g)
      • Threat
        • DUALS(2)
      • Vars
        • B(c);XS(F)::S(H)
        • S(d);::S(H),XP(h)
        • S(d);::S(H)
      • Refutation
        • S(b);XS(F)
    • Try
      • P(D);CHECK
      • Vars
        • S(b);P_SPINS(b)::R(A)
      • Refutation
        • Q(g);P_SPINQ(g)
  • Actual
    • S(F);
    • Threat
      • QAR2(C)
    • Vars
      • Q(g);N_GUARD,P_SPINQ(g),XP(D)::S(F)
      • Q(g);N_GUARD,XR(G)::S(F)
      • S(b);OGATE,P_SPINS(b),XP(D)::P(B)
      • Q(g);N_GUARD::S(H),XQ(g)
      • S(d);N_GUARD::QAB(C),XS(d)
      • S(d);N_GUARD,SBLOCK::QAB1(C)
      • S(d);N_GUARD::QAB(C)
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