MESON Chess Problem Database

Problem Display
PID: 262480 (1Rb2B2/2p5/4p3/1PN1P3/PkNR4/5Q1K/1r1P1b2/r2n1B2 w - - 0 1)

Hjelle, David

3rd HM., Europe Echecs, 1961

1Rb2B2/2p5/4p3/1PN1P3/PkNR4/5Q1K/1r1P1b2/r2n1B2

#2

12 + 8

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rab1
      • 2.Qa3#
    • 1...Rc1
      • 2.Qa3#
    • 1...Ra3
      • 2.Qxa3#
    • 1...Rxa4
      • 2.Sa6#
    • 1...Ra2
      • 2.Qb3#
    • 1...Rc2
      • 2.Qb3#
    • 1...Rxd2
      • 2.Qb3#
    • 1...Rb3
      • 2.Qxb3#
    • 1...Ba6
      • 2.bxa6#
    • 1...Sc3
      • 2.Qxc3#
      • 2.dxc3#
  • Tries
    • 1.Sxb2+?
      • 1...Ka5
        • 2.Sb3#
      • 1...Bxd4!
    • 1.Sa5+?
      • 1...Bxd4
        • 2.Sc6#
      • 1...Kxa5!
    • 1.Sb3+?
      • 1...Kxa4
        • 2.Sxb2#
        • 2.Sb6#
      • 1...c5!
    • 1.Sb7+?
      • 1...Kxa4
        • 2.Sxb2#
        • 2.Sb6#
      • 1...c5!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Qa5#
      • 1...Ra3+
        • 2.Se3#
      • 1...Rb3+
        • 2.Sd3#
      • 1...Rxa4
        • 2.Qxa4#
      • 1...Ba6
        • 2.bxa6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 5
  • Sets
    • R(a);N_GUARD::QAB1(C)
    • R(a);N_GUARD,P_PINQ(C)::QAB1(C),XR(a)
    • R(a);SBLOCK,XP(E)::B(L)+S(I),DCHECK
    • R(c);N_GUARD::QAR1(C)
    • R(c);N_GUARD,XP(B)::QAR1(C)
    • R(c);N_GUARD,P_PINQ(C)::QAR1(C),XR(c)
    • B(h);OGATE::R(K)+P(H),XB(h)
  • Tries
    • Try
      • S(F);CHECK,XR(c)
      • Vars
        • K(e);S_FLIGHT::S(I)
      • Refutation
        • B(d);XR(G)
    • Try
      • S(F);CHECK
      • Vars
        • B(d);XR(G)::S(F)
      • Refutation
        • K(e);S_FLIGHT,XS(F)
    • Try
      • S(I);CHECK
      • Refutation
        • P(g);P_SPINP(g)
    • Try
      • S(I);CHECK
      • Refutation
        • P(g);P_SPINP(g)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C)
    • Vars
      • R(a);CHECK,SBLOCK::R(G)+S(F)
      • R(c);CHECK,SBLOCK::B(L)+S(I),DCHECK
      • R(a);OGATE,XP(E)::QAR1(C),XR(a)
      • B(h);OGATE::R(K)+P(H),XB(h)
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