MESON Chess Problem Database

Problem Display
PID: 46647 (2n2KBB/3R3p/2PNNPp1/4k2r/2p1b3/p4p1p/3Q3b/q1r5 w - - 0 1)

Shanshin, Valery Yurevich

1st HM., The Problemist, 1999/I

2n2KBB/3R3p/2PNNPp1/4k2r/2p1b3/p4p1p/3Q3b/q1r5

#2

9 + 13

56 The Problemist 2003

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Qxd4#
    • 1...Qb1
      • 2.Qd4#
    • 1...Qa2
      • 2.Qd4#
    • 1...Rc3
      • 2.Qd4#
    • 1...Bb1
      • 2.Qa5#
    • 1...Bc2
      • 2.Qa5#
    • 1...Bd3
      • 2.Qa5#
    • 1...Bd5
      • 2.Qxh2#
    • 1...Bf5
      • 2.Qa5#
    • 1...Se7
      • 2.fxe7#
    • 1...c3
      • 2.Qd4#
  • Tries
    • 1.Sc7?
      • threat
        • 2.f7#
      • 1...Rf5
        • 2.Sf7#
      • 1...Sxd6!
    • 1.Re7?
      • threat
        • 2.f7#
      • 1...Sxd6
        • 2.Sd4#
      • 1...Sxe7
        • 2.fxe7#
      • 1...Qd4
        • 2.Qxd4#
      • 1...Bd5
        • 2.Qxh2#
      • 1...Rf5
        • 2.Sf7#
      • 1...Bd3!
    • 1.Qf4+?
      • 1...Kd5
        • 2.Qxe4#
      • 1...Bxf4!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Sf7#
      • 1...Qxd4
        • 2.Qxh2#
      • 1...Bxc6
        • 2.Sxc6#
      • 1...Sxd6
        • 2.Re7#
      • 1...Bd3
        • 2.Sxf3#
      • 1...Bb1
        • 2.Sxf3#
      • 1...Bc2
        • 2.Sxf3#
      • 1...Bd5
        • 2.f7#
      • 1...Bf5
        • 2.Sxf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 6
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • Q(a);N_GUARD::QAB1(A),XQ(a)
    • Q(a);N_GUARD::QAB1(A)
    • R(b);S_CUTQ(a)::QAB1(A)
    • B(h);N_GUARD::QAR(A)
    • B(h);SBLOCK::QAB(A),XB(c)
    • S(m);OGATE::B(I)+P(E),XS(m)
    • P(g);S_CUTQ(a)::QAB1(A)
  • Tries
    • Try
      • S(D);
      • Threat
        • B(I)+P(E)
      • Vars
        • R(j);P_PINP(E),SBLOCK::S(C)
      • Refutation
        • S(m);XS(C)
    • Try
      • R(F);
      • Threat
        • B(I)+P(E)
      • Vars
        • S(m);N_GUARD,SBLOCK,XS(C)::R(F)+S(D)
        • S(m);OGATE,XR(F)::B(I)+P(E),XS(m)
        • Q(a);N_GUARD::QAB1(A),XQ(a)
        • B(h);SBLOCK::QAB(A),XB(c)
        • R(j);P_PINP(E),SBLOCK::S(C)
      • Refutation
        • B(h);
    • Try
      • Q(A);CHECK
      • Vars
        • K(i);P-FLIGHT::QAB1(A),XB(h)
      • Refutation
        • B(c);XQ(A)
  • Actual
    • S(D);
    • Threat
      • S(C)
    • Vars
      • Q(a);SBLOCK,XS(D)::QAB(A),XB(c)
      • B(h);XP(B)::S(D),XB(h)
      • S(m);N_GUARD,SBLOCK,XS(C)::R(F)
      • B(h);N_GUARD::S(D),XP(e)
      • B(h);SBLOCK::B(I)+P(E)
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