MESON Chess Problem Database

Problem Display
PID: 177882 (n4Rq1/3p4/2p3p1/2Nk4/Q1NppPBb/BK6/4P3/3R4 w - - 0 1)

Shanshin, Valery Yurevich

4th HM., Sahs (Latvia), 1986

n4Rq1/3p4/2p3p1/2Nk4/Q1NppPBb/BK6/4P3/3R4

#2

10 + 9

6490 yacpdb 2018
3713 Snap 2019

SOLUTION

  • SOUND
  • Sets
    • 1...e3
      • 2.Bf3#
    • 1...g5
      • 2.Rf5#
    • 1...d6
      • 2.Se3#
  • Tries
    • 1.Sb6+?
      • 1...Sxb6
        • 2.Rxd4#
        • 2.Qxd4#
      • 1...Kd6+!
    • 1.Se6?
      • threat
        • 2.Se3#
        • 2.Rxd4#
      • 1...Qxe6
        • 2.Se3#
      • 1...dxe6
        • 2.Se3#
      • 1...e3
        • 2.Rxd4#
      • 1...Qg7
        • 2.Se3#
      • 1...Qh8
        • 2.Se3#
      • 1...Bf6
        • 2.Se3#
      • 1...d3
        • 2.Se3#
      • 1...c5
        • 2.Qxd7#
        • 2.Qxa8#
      • 1...Bf2!
    • 1.Sxd7?
      • threat
        • 2.Se3#
      • 1...Bf2
        • 2.Sf6#
      • 1...c5
        • 2.Qxa8#
      • 1...e3!
    • 1.Bf3?
      • threat
        • 2.Bxe4#
      • 1...exf3
        • 2.e4#
      • 1...d3
        • 2.Rxd3#
      • 1...Qe6!
    • 1.Bxd7?
      • threat
        • 2.Bxc6#
        • 2.Qxc6#
      • 1...Qe6
        • 2.Bxe6#
      • 1...d3!
  • Keys
    • 1.Sxe4!
      • threat
        • 2.Sc3#
      • 1...Kxe4
        • 2.Bf3#
      • 1...d3
        • 2.Se3#
      • 1...Be1
        • 2.Sf6#

This anticipates 200563(1993)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • P(b);OGATEB::B(H)
    • P(f);N_GUARD::R(J)
    • P(g);SBLOCK::S(F)
  • Tries
    • Try
      • S(F);CHECK
      • Refutation
        • K(d);CHECK,P-FLIGHT
    • Try
      • S(I);
      • Threat
        • DUALS(2)
      • Vars
        • Q(i);XS(I)::S(F)
        • P(g);XS(I)::S(F)
        • P(b);::R1(A),XP(a)
        • Q(i);::S(F)
        • B(c);::S(F)
        • P(a);::S(F)
      • Refutation
        • B(c);
    • Try
      • S(I);XP(g)
      • Threat
        • S(F)
      • Vars
        • B(c);N_GUARD::S(I)
        • P(e);OGATEB::QAB(E),XS(h)
      • Refutation
        • P(b);
    • Try
      • B(H);
      • Threat
        • B(H),XP(b)
      • Vars
        • P(b);OGATE,XB(H)::P(B)
        • P(a);OGATEB::R(A),XP(a)
      • Refutation
        • Q(i);
    • Try
      • B(H);XP(g)
      • Threat
        • DUALS(2)
      • Vars
        • Q(i);N_GUARD::B(H),XQ(i)
      • Refutation
        • P(a);
  • Actual
    • S(I);XP(b)
    • Threat
      • S(I)
    • Vars
      • K(d);N_SPINP(a),OGATEB,P_PINS(F),S_FLIGHT,XS(I)::B(H)
      • P(a);::S(F)
      • B(c);N_GUARD::S(I)
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