MESON Chess Problem Database

Problem Display
PID: 117027 (1r6/8/B1NPp3/pb4Rp/p1N5/2k1pPB1/P1P5/bQ4K1 w - - 0 1)

Kopaev, Viacheslav Georgievich

64 Shakhmatnoe obozrenie, 1991

1r6/8/B1NPp3/pb4Rp/p1N5/2k1pPB1/P1P5/bQ4K1

#2

11 + 9

6490 yacpdb 2009
5454 Near Snap 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Bxc4
      • 2.Be1#
    • 1...Bxc6
      • 2.Be5#
    • 1...a3
      • 2.Qb3#
  • Tries
    • 1.Sa3?
      • threat
        • 2.Be1#
      • 1...Kd2
        • 2.Qe1#
      • 1...Bxc6!
    • 1.Sxe3?
      • threat
        • 2.Be1#
      • 1...Kd2
        • 2.Qe1#
      • 1...Bxc6!
    • 1.S6xa5?
      • threat
        • 2.Be5#
      • 1...Kd4
        • 2.Qxa1#
      • 1...Bb2
        • 2.Qxb2#
      • 1...e5
        • 2.Bxe5#
      • 1...Bxc4!
    • 1.Bxb5?
      • threat
        • 2.Be1#
        • 2.Be5#
      • 1...e5
        • 2.Be1#
        • 2.Bxe5#
      • 1...Rxb5!
    • 1.Rg4?
      • threat
        • 2.Be1#
        • 2.Be5#
      • 1...Bxc4
        • 2.Be1#
      • 1...e5
        • 2.Be1#
        • 2.Bxe5#
      • 1...hxg4!
    • 1.Rc5?
      • threat
        • 2.Be1#
        • 2.Be5#
      • 1...Bxc4
        • 2.Be1#
      • 1...Bxc6
        • 2.Be5#
      • 1...e5
        • 2.Be1#
        • 2.Bxe5#
      • 1...Rg8!
    • 1.Qxa1+?
      • 1...Kxc4
        • 2.Qd4#
      • 1...Kxc2!
    • 1.Qb2+?
      • 1...Kxc4
        • 2.Sxa5#
      • 1...Bxb2!
  • Keys
    • 1.Qd1!
      • threat
        • 2.Qd3#
      • 1...Kxc4
        • 2.Qd3#
      • 1...Bxc4
        • 2.Be5#
      • 1...Bxc6
        • 2.Be1#

This anticipates 117428(1991)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • B(f);XS(G)::B(F)
    • B(f);XS(J)::B(F)
    • P(d);N_GUARD::QAR1(A)
  • Tries
    • Try
      • S(G);
      • Threat
        • B(F)
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
      • Refutation
        • B(f);XS(J)
    • Try
      • S(G);XP(c)
      • Threat
        • B(F)
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
      • Refutation
        • B(f);XS(J)
    • Try
      • S(J);XP(e)
      • Threat
        • B(F)
      • Vars
        • K(b);S_FLIGHT::QAB(A),XB(a)
        • B(a);N_GUARD::QAB1(A),XB(a)
        • P(h);::B(F),XP(h)
      • Refutation
        • B(f);XS(G)
    • Try
      • B(I);XB(f)
      • Threat
        • DUALS(2)
      • Refutation
        • R(i);XB(I)
    • Try
      • R(H);
      • Threat
        • DUALS(2)
      • Vars
        • B(f);XS(G)::B(F)
      • Refutation
        • P(g);XR(H)
    • Try
      • R(H);
      • Threat
        • DUALS(2)
      • Vars
        • B(f);P_SPINB(f),XS(G)::B(F)
        • B(f);XS(J)::B(F)
      • Refutation
        • R(i);P_PINB(F)
    • Try
      • Q(A);CHECK,XB(a)
      • Vars
        • K(b);OGATE,P-FLIGHT,P_SPINB(f),XS(G)::QAR1(A)
      • Refutation
        • K(b);P-FLIGHT,XP(D)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT,P_SPINB(f),XS(G)::S(J),XP(e)
      • Refutation
        • B(a);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • K(b);P-FLIGHT,P_SPINB(f),XS(G)::QAB1(A)
      • B(f);XS(G)::B(F)
      • B(f);XS(J)::B(F)
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