MESON Chess Problem Database

Problem Display
PID: 225456 (1K4B1/3p4/2ppQ3/2p1PP2/R1Nbk1P1/4P3/2PRN1P1/5n2 w - - 0 1)

Erokhin, Vladimir Alekseevich

3rd HM., Praca, 1997

1K4B1/3p4/2ppQ3/2p1PP2/R1Nbk1P1/4P3/2PRN1P1/5n2

#2

13 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bc3
      • 2.Sxc3#
    • 1...Bxe3
      • 2.Sxd6#
    • 1...Bxe5
      • 2.Sc3#
    • 1...Sxd2
      • 2.Sg3#
    • 1...Sh2
      • 2.Sg3#
    • 1...Sxe3
      • 2.Sxd6#
    • 1...Sg3
      • 2.Sxg3#
  • Tries
    • 1.Bh7?
      • threat
        • 2.f6#
      • 1...Sxe3
        • 2.Sxd6#
      • 1...Sg3
        • 2.Sxg3#
      • 1...dxe6!
    • 1.Rd3?
      • threat
        • 2.Sxd6#
      • 1...dxe5
        • 2.Sd6#
      • 1...d5
        • 2.Sd6#
      • 1...dxe6!
    • 1.Ra3?
      • threat
        • 2.Sxd6#
      • 1...dxe5
        • 2.Sd6#
      • 1...Bc3
        • 2.Sxc3#
      • 1...d5
        • 2.Sd6#
      • 1...dxe6!
    • 1.Qxd6?
      • 1...Bxe3
        • 2.Qd3#
      • 1...Bxe5
        • 2.Qxe5#
      • 1...Sxd2
        • 2.Sg3#
      • 1...Ba1
        • 2.Qd3#
      • 1...Bb2
        • 2.Qd3#
      • 1...Bc3
        • 2.Sxc3#
        • 2.Qd3#
      • 1...Sh2
        • 2.Sg3#
      • 1...Sg3
        • 2.Sxg3#
      • 1...Sxe3!
    • 1.Qg6?
      • threat
        • 2.f6#
      • 1...Sg3
        • 2.Sxg3#
      • 1...Sxe3!
    • 1.exd6+?
      • 1...Be5
        • 2.Sc3#
        • 2.Qxe5#
      • 1...dxe6!
    • 1.f6?
      • threat
        • 2.Bh7#
        • 2.Qf5#
      • 1...Sxe3
        • 2.Sxd6#
      • 1...Sg3
        • 2.Sxg3#
      • 1...dxe6!
  • Keys
    • 1.Qh6!
      • threat
        • 2.Qf4#
      • 1...Bxe3
        • 2.Sc3#
      • 1...Bxe5
        • 2.Sxd6#
      • 1...dxe5
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • B(b);N_GUARD::S(C),XB(b)
    • B(b);SBLOCK,XP(E)::R(F)+S(G),DCHECK,XP(f)
    • B(b);N_GUARD,P_SPINB(b),XP(I)::S(C)
    • S(a);N_GUARD,XR(B)::S(C)
    • S(a);N_GUARD::S(C)
    • S(a);SBLOCK,XP(E)::S(G),XP(f)
    • S(a);N_GUARD::S(C),XS(a)
  • Tries
    • Try
      • B(M);
      • Threat
        • B(M)+P(J)
      • Vars
        • S(a);SBLOCK,XP(E)::S(G),XP(f)
        • S(a);N_GUARD::S(C),XS(a)
      • Refutation
        • P(g);XQ(K)
    • Try
      • R(B);
      • Threat
        • S(G),XP(f)
      • Vars
        • P(f);P_SPINP(f),XP(I)::S(G)
        • P(f);::S(G)
      • Refutation
        • P(g);XQ(K)
    • Try
      • R(F);
      • Threat
        • S(G),XP(f)
      • Vars
        • P(f);P_SPINP(f),XP(I)::S(G)
        • B(b);N_GUARD::S(C),XB(b)
        • P(f);::S(G)
      • Refutation
        • P(g);XQ(K)
    • Try
      • Q(K);XP(f)
      • Vars
        • B(b);OGATE,XP(E)::QAB1(K)
        • B(b);OGATE,P_PINQ(K),XP(I)::QAR1(K),XB(b)
        • S(a);N_GUARD,XR(B)::S(C)
        • B(b);OGATE::QAB1(K)
        • S(a);N_GUARD::S(C)
        • S(a);N_GUARD::S(C),XS(a)
      • Refutation
        • S(a);XP(E)
    • Try
      • Q(K);
      • Threat
        • QAB(K)+P(J)
      • Vars
        • S(a);N_GUARD::S(C),XS(a)
      • Refutation
        • S(a);XP(E)
    • Try
      • P(I);CHECK,XP(f)
      • Refutation
        • P(g);XQ(K)
    • Try
      • P(J);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);SBLOCK,XP(E)::S(G),XP(f)
        • S(a);N_GUARD::S(C),XS(a)
      • Refutation
        • P(g);XQ(K)
  • Actual
    • Q(K);
    • Threat
      • QAR1(K)
    • Vars
      • B(b);N_GUARD,XP(E)::S(C)
      • B(b);SBLOCK,XP(I)::R(F)+S(G),DCHECK,XP(f)
      • P(f);SBLOCK,XP(I)::S(G)
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