MESON Chess Problem Database

Problem Display
PID: 260795 (2b5/2r1p2p/1pp1RPP1/1Pk1K2Q/2B1RB2/P1P3p1/3N4/1q3rbn w - - 0 1)

Johner, Hans

Neue Zurcher Zeitung, 1961

2b5/2r1p2p/1pp1RPP1/1Pk1K2Q/2B1RB2/P1P3p1/3N4/1q3rbn

#2

12 + 12

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qd3
      • 2.Sb3#
    • 1...Qxe4+
      • 2.Kxe4#
    • 1...Qa1
      • 2.Sb3#
    • 1...Qc1
      • 2.Sb3#
    • 1...Qe1
      • 2.Sb3#
    • 1...Qb3
      • 2.Sxb3#
    • 1...Qb4
      • 2.axb4#
      • 2.cxb4#
    • 1...Rf2
      • 2.Be3#
    • 1...Rxf4
      • 2.Kxf4#
    • 1...Ra7
      • 2.Rxc6#
    • 1...Rb7
      • 2.Rxc6#
    • 1...Rd7
      • 2.Rxc6#
    • 1...Bh2
      • 2.Be3#
    • 1...Be3
      • 2.Bxe3#
    • 1...Bd4+
      • 2.cxd4#
    • 1...Bxe6
      • 2.Kxe6#
    • 1...Sf2
      • 2.Be3#
    • 1...exf6+
      • 2.Kxf6#
  • Keys
    • 1.Kf5!
      • threat
        • 2.Kg4#
      • 1...Qxe4+
        • 2.Kxe4#
      • 1...Rxf4+
        • 2.Kxf4#
      • 1...Bxe6+
        • 2.Kxe6#
      • 1...hxg6+
        • 2.Kxg6#
      • 1...exf6
        • 2.Kxf6#
      • 1...Qd3
        • 2.Sb3#
      • 1...Qd1
        • 2.Re5#
      • 1...Rd7
        • 2.Rxc6#
      • 1...Bd4
        • 2.cxd4#
      • 1...Sf2
        • 2.Be3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 9
  • Sets
    • Q(a);N_GUARD::S(A)
    • Q(a);CHECK,XR(E)::QAR(I)+K(H),XQ(a)
    • Q(a);N_GUARD,P_PINP(C)::S(A)
    • Q(a);N_GUARD,P_PINR(E)::S(A)
    • Q(a);N_GUARD::S(A),XQ(a)
    • R(b);S_CUTB(c)::B(F)
    • R(b);XB(F)::QAR(I)+K(H),XR(b)
    • R(i);N_GUARD::R1(J),XP(h)
    • B(c);N_GUARD::B(F)
    • B(c);N_GUARD::B(F),XB(c)
    • B(c);CHECK,OGATE::P(C),XB(c)
    • B(l);XR(J)::QAR(I)+K(H),XB(l)
    • S(d);S_CUTB(c)::B(F)
    • P(j);CHECK,XP(K)::QAR(I)+K(H),XP(j)
  • Actual
    • K(H);P-FLIGHT,P_SPINB(F),P_SPINR(E)
    • Threat
      • QAR(I)+K(H)
    • Vars
      • Q(a);CHECK,P_PINR(J),XR(E)::QAR(I)+K(H),XQ(a)
      • R(b);CHECK,XB(F)::QAR(I)+K(H),XR(b)
      • B(l);CHECK,XR(J)::QAR(I)+K(H),XB(l)
      • P(k);CHECK,XP(L)::QAR(I)+K(H),XP(k)
      • P(j);XP(K)::QAR(I)+K(H),XP(j)
      • Q(a);N_GUARD::S(A)
      • Q(a);N_PINR(E),P_PINR(J)::R(E)
      • R(i);OGATE::R1(J),XP(h)
      • B(c);OGATE::P(C),XB(c)
      • S(d);N_PINB(F)::B(F)
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