MESON Chess Problem Database

Problem Display
PID: 150823 (8/K2p4/3NPR2/1P1k1N2/2Rp1P2/2pbpp2/P1Q5/5q2 w - - 0 1)

Alaikov, Venelin

Neue Zurcher Zeitung, 1999

8/K2p4/3NPR2/1P1k1N2/2Rp1P2/2pbpp2/P1Q5/5q2

#2

10 + 8

15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Be2
      • 2.Qe4#
    • 1...Be4
      • 2.Qxe4#
  • Tries
    • 1.Kb6?
      • threat
        • 2.Rxd4#
        • 2.Rc5#
      • 1...Bxc4
        • 2.Qe4#
      • 1...Bxf5!
    • 1.Se4?
      • threat
        • 2.Rxd4#
      • 1...Kxc4
        • 2.Qb3#
      • 1...Kxe4
        • 2.Rxd4#
      • 1...Bxc4
        • 2.Se7#
      • 1...Bxe4!
    • 1.Rc6?
      • threat
        • 2.Se7#
      • 1...Bxf5
        • 2.Qxf5#
      • 1...dxc6!
    • 1.Qxd3?
      • threat
        • 2.Qe4#
        • 2.Qxd4#
      • 1...Qb1
        • 2.Qxd4#
      • 1...Qd1
        • 2.Qe4#
      • 1...Qxd3!
    • 1.Qxc3?
      • threat
        • 2.Rxd4#
        • 2.Rc5#
        • 2.Qxd4#
      • 1...Bxc4
        • 2.Qxd4#
      • 1...Bxf5
        • 2.Rxd4#
        • 2.Qxd4#
      • 1...Qa1
        • 2.Rxd4#
        • 2.Rc5#
      • 1...dxc3!
    • 1.exd7?
      • threat
        • 2.Se7#
      • 1...Bxf5
        • 2.Qxf5#
      • 1...Bxc4!
  • Keys
    • 1.Sb7!
      • threat
        • 2.Rxd4#
      • 1...Kxc4
        • 2.Qb3#
      • 1...Ke4
        • 2.Rxd4#
      • 1...Bxc4
        • 2.Se7#
      • 1...Bxf5
        • 2.Rc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • B(c);OGATE::QAB1(B)
    • B(c);OGATE::QAB1(B),XB(c)
  • Tries
    • Try
      • K(J);S_FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • B(c);OGATE,XR(C)::QAB1(B)
      • Refutation
        • B(c);XS(F)
    • Try
      • S(G);
      • Threat
        • R1(C),XP(f)
      • Vars
        • K(g);OGATEB,P_SPINP(b),S_FLIGHT,XR(C)::QAB1(B)
        • K(g);P_SPINB(c),P_SPINP(f),S_FLIGHT,XS(G)::R1(C),XP(f)
        • B(c);SBLOCK,XR(C)::S(F)
      • Refutation
        • B(c);XS(G)
    • Try
      • R(C);
      • Threat
        • S(F)
      • Vars
        • B(c);OGATE,XS(F)::QAR2(B),XB(c)
      • Refutation
        • P(h);XR(C)
    • Try
      • Q(B);P_PINP(f),XB(c)
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);::QAR1(B),XP(f)
        • Q(a);::QAB1(B)
      • Refutation
        • Q(a);N_SPINP(f),XQ(B)
    • Try
      • Q(B);XP(b)
      • Threat
        • DUALS(3)
      • Vars
        • B(c);XR(C)::QAR1(B),XP(f)
      • Refutation
        • P(f);XQ(B)
    • Try
      • P(H);XP(h)
      • Threat
        • S(F)
      • Vars
        • B(c);OGATE,XS(F)::QAR2(B),XB(c)
      • Refutation
        • B(c);XR(C)
  • Actual
    • S(G);
    • Threat
      • R1(C),XP(f)
    • Vars
      • K(g);OGATEB,P_SPINP(b),S_FLIGHT,XR(C)::QAB1(B)
      • K(g);P_SPINB(c),P_SPINP(f),S_FLIGHT::R1(C),XP(f)
      • B(c);SBLOCK,XR(C)::S(F)
      • B(c);XS(F)::R1(C)
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