MESON Chess Problem Database

Problem Display
PID: 150508 (b7/2pQK3/2N5/R3B3/1R1pk1p1/8/2p2P2/1r1qr1N1 w - - 0 1)

Kovacevic, Marjan

1st Prize, Neue Zurcher Zeitung, 2008-2009

b7/2pQK3/2N5/R3B3/1R1pk1p1/8/2p2P2/1r1qr1N1

#2

8 + 9

23 Die Schwalbe 2013
56 The Problemist 2015
145 StrateGems 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kd3
      • 2.Qxd4#
    • 1...Qe2
      • 2.Rxd4#
    • 1...Qf3
      • 2.Rxd4#
    • 1...Qc1
      • 2.Rxd4#
    • 1...Qd3
      • 2.Qxg4#
  • Tries
    • 1.Ke6?
      • threat
        • 2.Qh7#
      • 1...Kd3
        • 2.Qxd4#
      • 1...Qf3
        • 2.Rxd4#
        • 2.Qxd4#
      • 1...Rxg1!
    • 1.Kf6?
      • threat
        • 2.Qf5#
        • 2.Qh7#
      • 1...Kd3
        • 2.Qxd4#
      • 1...Rxg1
        • 2.Qf5#
      • 1...Qf3+!
    • 1.Kd8?
      • threat
        • 2.Qh7#
      • 1...Kd3
        • 2.Qxd4#
      • 1...Qf3
        • 2.Rxd4#
      • 1...Rxg1!
    • 1.Sxd4?
      • threat
        • 2.Qf5#
      • 1...Kd3
        • 2.Sc6#
      • 1...Qxd4
        • 2.Rxd4#
      • 1...Qf3
        • 2.Sb3#
      • 1...c5!
    • 1.Bh2?
      • threat
        • 2.Qf5#
      • 1...Qf3
        • 2.Rxd4#
        • 2.Qxd4#
      • 1...Kd3+!
    • 1.Bg3?
      • threat
        • 2.Qf5#
      • 1...Qf3
        • 2.Rxd4#
        • 2.Qxd4#
      • 1...Kd3+!
    • 1.Bd6?
      • threat
        • 2.Qf5#
      • 1...Qf3
        • 2.Rxd4#
      • 1...Kd3+!
    • 1.Bxc7?
      • threat
        • 2.Qf5#
      • 1...Qf3
        • 2.Rxd4#
        • 2.Qxd4#
      • 1...Kd3+!
    • 1.Qxg4+?
      • 1...Kd3
        • 2.Qxd4#
      • 1...Qxg4!
    • 1.Qd5+?
      • 1...Kd3
        • 2.Qxd4#
      • 1...Kf5!
  • Keys
    • 1.Bxd4!
      • threat
        • 2.Qf5#
      • 1...Kd3+
        • 2.Be5#
      • 1...Kf4+
        • 2.Be3#
      • 1...Qf3
        • 2.Bb2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • K(f);P_PINB(E),S_FLIGHT::QAR1(G),XP(e)
    • Q(b);N_GUARD::R1(C),XP(e)
    • Q(b);N_GUARD,SBLOCK::QAR2(G),XP(g)
  • Tries
    • Try
      • K(H);P-FLIGHT
      • Threat
        • QAB(G)
      • Vars
        • K(f);P_PINB(E),S_FLIGHT::QAR1(G),XP(e)
      • Refutation
        • R(c);XS(A)
    • Try
      • K(H);S_FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • K(f);S_FLIGHT::QAR1(G),XP(e)
        • R(c);XS(A)::QAB1(G)
      • Refutation
        • Q(b);CHECK
    • Try
      • K(H);S_FLIGHT
      • Threat
        • QAB(G)
      • Vars
        • K(f);S_FLIGHT::QAR1(G),XP(e)
        • Q(b);N_GUARD::R1(C),XP(e)
      • Refutation
        • R(c);XS(A)
    • Try
      • S(F);XP(e)
      • Threat
        • QAB1(G)
      • Vars
        • K(f);P_PINB(E),S_FLIGHT::QAR(G)+S(F)
        • Q(b);OGATE,P_SPINQ(b),XS(F)::R1(C),XQ(b)
        • Q(b);N_GUARD::R(C)+S(F)
      • Refutation
        • P(h);
    • Try
      • B(E);
      • Threat
        • QAB1(G)
      • Refutation
        • K(f);CHECK,S_FLIGHT
    • Try
      • B(E);
      • Threat
        • QAB1(G)
      • Refutation
        • K(f);CHECK,S_FLIGHT
    • Try
      • B(E);
      • Threat
        • QAB1(G)
      • Vars
        • Q(b);N_GUARD::R1(C),XP(e)
      • Refutation
        • K(f);CHECK,N_SPINP(e),S_FLIGHT
    • Try
      • B(E);XP(h)
      • Threat
        • QAB1(G)
      • Refutation
        • K(f);CHECK,S_FLIGHT
    • Try
      • Q(G);CHECK,XP(g)
      • Vars
        • K(f);N_SPINP(e),OGATE,P_PINB(E),S_FLIGHT::QAR1(G),XP(e)
      • Refutation
        • Q(b);XQ(G)
    • Try
      • Q(G);CHECK
      • Vars
        • K(f);P_PINB(E),S_FLIGHT::QAR1(G),XP(e)
      • Refutation
        • K(f);N_SPINP(e),P_PINB(E),S_FLIGHT
  • Actual
    • B(E);XP(e)
    • Threat
      • QAB1(G)
    • Vars
      • K(f);CHECK,S_FLIGHT::QAR(G)+B(E)
      • K(f);CHECK,P-FLIGHT::R(C)+B(E),DCHECK
      • Q(b);N_GUARD::R(C)+B(E)
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