MESON Chess Problem Database

Problem Display
PID: 54708 (8/p7/P2B2p1/3p2P1/2pkp2p/3p3P/1p1N1PP1/1N1QKB2 w - - 0 1)

Ivanov, Vadim Aleksandrovich

The Problemist, 2003

8/p7/P2B2p1/3p2P1/2pkp2p/3p3P/1p1N1PP1/1N1QKB2

#2

11 + 9

5454 Near Snap 2010

SOLUTION

  • SOUND
  • Sets
    • 1...c3
      • 2.Qa4#
    • 1...e3
      • 2.Qg4#
  • Tries
    • 1.Sxc4?
      • 1...d2+
        • 2.Qxd2#
      • 1...Kxc4
        • 2.Qa4#
      • 1...e3
        • 2.Qg4#
        • 2.Qxd3#
      • 1...dxc4!
    • 1.Be2?
      • 1...dxe2
        • 2.Sb3#
        • 2.Sf3#
      • 1...c3
        • 2.Qa4#
      • 1...e3!
    • 1.Qc2?
      • threat
        • 2.Qc3#
      • 1...c3
        • 2.Qa4#
        • 2.Qxc3#
      • 1...dxc2!
    • 1.Qe2?
      • threat
        • 2.Qe3#
      • 1...e3
        • 2.Qg4#
        • 2.Qxe3#
        • 2.fxe3#
      • 1...dxe2!
    • 1.Qb3?
      • threat
        • 2.Qc3#
      • 1...c3
        • 2.Qa4#
        • 2.Qxc3#
        • 2.Qb4#
      • 1...cxb3!
    • 1.Qf3?
      • threat
        • 2.Qe3#
        • 2.Qf6#
      • 1...e3
        • 2.Qg4#
        • 2.Qxe3#
        • 2.Qf4#
        • 2.Qf6#
        • 2.fxe3#
      • 1...exf3!
    • 1.g3?
      • 1...c3
        • 2.Qa4#
      • 1...e3
        • 2.Qg4#
      • 1...hxg3!
  • Keys
    • 1.Bxd3!
      • 1...Kxd3
        • 2.Sf1#
        • 2.Sb3#
        • 2.Sf3#
      • 1...cxd3
        • 2.Qa4#
      • 1...exd3
        • 2.Qg4#
      • 1...c3
        • 2.Sb3#
      • 1...e3
        • 2.Sf3#

Anticipated by 120984(1980), 108720(1982), 225551(1994)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(c);OGATEB::QAR(B)
    • P(e);OGATEB::QAR(B)
  • Tries
    • Try
      • S(E);P_PINP(b),XP(c)
      • Vars
        • P(b);CHECK,OGATEB::QAR2(B),XP(b)
        • K(d);OGATEB,P-FLIGHT,XS(E)::QAR2(B)
      • Refutation
        • P(g);XS(E)
    • Try
      • B(D);
      • Vars
        • P(c);OGATEB::QAR(B)
      • Refutation
        • P(e);
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Refutation
        • P(b);XQ(B)
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Refutation
        • P(b);XQ(B)
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Refutation
        • P(c);XQ(B)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Refutation
        • P(e);XQ(B)
    • Try
      • P(G);
      • Vars
        • P(c);OGATEB::QAR(B)
        • P(e);OGATEB::QAR(B)
      • Refutation
        • P(f);XP(G)
  • Actual
    • B(D);XP(b)
    • Vars
      • P(c);OGATEB,SBLOCK,XB(D)::QAR(B)
      • P(e);OGATEB,SBLOCK,XB(D)::QAR(B)
      • P(c);N_GUARD::S(E)
      • P(e);N_GUARD::S(E)
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