MESON Chess Problem Database

Problem Display
PID: 117428 (1K6/7B/4N2n/pR2Pbp1/4N1p1/BPp1k2p/4P3/5Qb1 w - - 0 1)

Lobusov, Andrey Jakovlevic

Krasny Sever, 1991

1K6/7B/4N2n/pR2Pbp1/4N1p1/BPp1k2p/4P3/5Qb1

#2

10 + 9

693 Neue Zurcher Zeitung 1992
3705 Album Russia (1992-1994) 2000
6490 yacpdb 2009
5454 Near Snap 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Bxe4
      • 2.Bc1#
    • 1...Bxe6
      • 2.Bc5#
    • 1...g3
      • 2.Qf3#
  • Tries
    • 1.Sxc3?
      • threat
        • 2.Bc1#
      • 1...Kd2
        • 2.Qc1#
      • 1...Bxe6!
    • 1.Sg3?
      • threat
        • 2.Bc1#
      • 1...Kd2
        • 2.Qc1#
      • 1...Bxe6!
    • 1.S6xg5?
      • threat
        • 2.Bc5#
      • 1...Kd4
        • 2.Qxg1#
      • 1...Bf2
        • 2.Qxf2#
      • 1...Bxe4!
    • 1.Qxg1+?
      • 1...Kxe4
        • 2.Qd4#
      • 1...Kxe2!
    • 1.Qf2+?
      • 1...Kxe4
        • 2.Sxg5#
      • 1...Bxf2!
  • Keys
    • 1.Qd1!
      • threat
        • 2.Qd3#
      • 1...Kxe4
        • 2.Qd3#
      • 1...Bxe4
        • 2.Bc5#
      • 1...Bxe6
        • 2.Bc1#

Anticipated by 117027(1991)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • B(g);XS(E)::B(C)
    • B(g);XS(H)::B(C)
    • P(e);N_GUARD::QAR1(A)
  • Tries
    • Try
      • S(E);XP(b)
      • Threat
        • B(C)
      • Vars
        • K(c);S_FLIGHT::QAB1(A)
      • Refutation
        • B(g);XS(H)
    • Try
      • S(E);
      • Threat
        • B(C)
      • Vars
        • K(c);S_FLIGHT::QAB1(A)
      • Refutation
        • B(g);XS(H)
    • Try
      • S(H);XP(h)
      • Threat
        • B(C)
      • Vars
        • K(c);S_FLIGHT::QAB(A),XB(a)
        • B(a);N_GUARD::QAB1(A),XB(a)
      • Refutation
        • B(g);XS(E)
    • Try
      • Q(A);CHECK,XB(a)
      • Vars
        • K(c);OGATE,P-FLIGHT,P_SPINB(g),XS(E)::QAR1(A)
      • Refutation
        • K(c);P-FLIGHT,XP(B)
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);P-FLIGHT,P_SPINB(g),XS(E)::S(H),XP(h)
      • Refutation
        • B(a);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • K(c);P-FLIGHT,P_SPINB(g),XS(E)::QAB1(A)
      • B(g);XS(E)::B(C)
      • B(g);XS(H)::B(C)
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