MESON Chess Problem Database

Problem Display
PID: 260948 (5q2/2n2p2/b3PN1b/r1B2p2/p1P2k1P/4R1pr/K6n/2Q5 w - - 0 1)

Johner, Hans

Neue Zurcher Zeitung, 1941

5q2/2n2p2/b3PN1b/r1B2p2/p1P2k1P/4R1pr/K6n/2Q5

#2

8 + 12

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Bxc4+
      • 2.Qxc4#
    • 1...Sf1
      • 2.Qxf1#
    • 1...Sf3
      • 2.Re4#
    • 1...Sg4
      • 2.Sh5#
  • Tries
    • 1.Bd6+?
      • 1...Re5
        • 2.Bxe5#
        • 2.Ra3#
        • 2.Rb3#
        • 2.Rc3#
        • 2.Rd3#
      • 1...Qxd6!
    • 1.Qf1+?
      • 1...Sf3
        • 2.Qxf3#
      • 1...Sxf1!
  • Keys
    • 1.Bd4!
      • threat
        • 2.Ra3#
        • 2.Rb3#
        • 2.Rc3#
        • 2.Rd3#
      • 1...Qa3+
        • 2.Rxa3#
      • 1...Bxc4+
        • 2.Rb3#
      • 1...Qb4
        • 2.Rc3#
      • 1...Re5
        • 2.Bxe5#
      • 1...Sf1
        • 2.Qxf1#
      • 1...Sf3
        • 2.Re4#
      • 1...Sg4
        • 2.Sh5#
      • 1...Sd5
        • 2.Be5#
      • 1...g2
        • 2.Rxh3#
      • 1...a3
        • 2.Rxa3#
        • 2.Rb3#
        • 2.Rc3#
        • 2.Rd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • B(h);CHECK,OGATE,XP(D)::QAR(A),XB(h)
    • S(a);N_GUARD::QAR(A),XS(a)
    • S(a);SBLOCK::QAB(A)+R(C),DCHECK
    • S(a);SBLOCK::S(H)
  • Tries
    • Try
      • B(F);CHECK
      • Refutation
        • Q(l);XB(F)
    • Try
      • Q(A);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAR1(A),XS(a)
      • Refutation
        • S(a);XQ(A)
  • Actual
    • B(F);
    • Threat
      • DUALS(4)
    • Vars
      • Q(l);CHECK::QAB(A)+R(C),XQ(l)
      • B(h);CHECK,XP(D)::QAB(A)+R(C)
      • Q(l);::QAB(A)+R(C)
      • R(f);N_GUARD::B(F),XR(f)
      • S(a);N_GUARD::QAR(A),XS(a)
      • S(a);SBLOCK::QAB(A)+R(C),DCHECK
      • S(a);SBLOCK::S(H)
      • S(j);S_CUTR(f)::B(F)
      • P(b);OGATE::QAB(A)+R(C),XR(c)
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