MESON Chess Problem Database

Problem Display
PID: 68771 (qbbR1nB1/3pN2p/p4K2/2p1pQN1/2rk1B2/2r1R3/8/6n1 w - - 0 1)

Kofman, Rafael Moiseevich

Loshinski, Lev Ilich

1st Prize, Gavrilov MT, 1947

qbbR1nB1/3pN2p/p4K2/2p1pQN1/2rk1B2/2r1R3/8/6n1

#2

8 + 13

45 Schach 1952

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4
      • 2.Qxe4#
    • 1...Qc6+
      • 2.Sxc6#
    • 1...Qa7
      • 2.Sc6#
      • 2.Qe4#
    • 1...Rc1
      • 2.Rd3#
      • 2.Qd3#
    • 1...Rc2
      • 2.Rd3#
      • 2.Qd3#
    • 1...Rd3
      • 2.Rxd3#
      • 2.Qxd3#
    • 1...Ba7
      • 2.Qxe5#
    • 1...Se6
      • 2.Sxe6#
    • 1...Sg6
      • 2.Se6#
    • 1...d5
      • 2.Qe4#
    • 1...d6
      • 2.Qxe5#
  • Tries
    • 1.Bxe5+?
      • 1...Bxe5+
        • 2.Qxe5#
      • 1...Kxe3!
    • 1.Re4+?
      • 1...Qxe4
        • 2.Qxe4#
      • 1...Kd3!
    • 1.Qc2?
      • threat
        • 2.Sf5#
      • 1...Qc6+
        • 2.Sxc6#
      • 1...Qe4
        • 2.Rxe4#
        • 2.Qxe4#
      • 1...Se6
        • 2.Sxe6#
      • 1...d5
        • 2.Re4#
        • 2.Qe4#
      • 1...d6!
    • 1.Qe6?
      • threat
        • 2.Sf5#
      • 1...Rxe3
        • 2.Qxc4#
      • 1...Sxe6
        • 2.Sxe6#
      • 1...Rd3
        • 2.Qxc4#
      • 1...Qe4!
    • 1.Qxd7+?
      • 1...Qd5
        • 2.Sf5#
        • 2.Sc6#
        • 2.Qxd5#
      • 1...Bd6
        • 2.Sf5#
      • 1...Bxd7
        • 2.Sf5#
      • 1...Sxd7+!
  • Keys
    • 1.Qh3!
      • threat
        • 2.Sf5#
      • 1...Qc6+
        • 2.Sxc6#
      • 1...Rxe3
        • 2.Qxe3#
      • 1...Rd3
        • 2.Rxd3#
      • 1...d6
        • 2.Bxe5#
      • 1...Qe4
        • 2.Rxe4#
      • 1...Se6
        • 2.Sxe6#
      • 1...d5
        • 2.Re4#

Correction pointed out by D. M. Modak (Nasik, India) that this is a #2, not a #3

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(j);N_GUARD::QAR1(C),XQ(j)
    • Q(j);CHECK,N_GUARD::S(F),XQ(j)
    • B(k);N_GUARD::QAB1(C),XP(f)
    • S(m);N_GUARD::S(D),XS(m)
    • S(m);N_GUARD::S(D)
    • P(h);S_CUTQ(j)::QAR1(C)
    • P(h);S_CUTB(k)::QAB1(C),XP(f)
  • Tries
    • Try
      • B(B);CHECK,XP(f)
      • Vars
        • B(k);CHECK,OGATE,XB(B)::QAB1(C),XB(k)
      • Refutation
        • K(d);N_SPINP(h),S_FLIGHT,XR(A)
    • Try
      • R(A);CHECK
      • Vars
        • Q(j);OGATE,XR(A)::QAR1(C),XQ(j)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • S(F)
      • Vars
        • Q(j);CHECK,N_GUARD::S(F),XQ(j)
        • S(m);N_GUARD::S(D),XS(m)
      • Refutation
        • P(h);
    • Try
      • Q(C);
      • Threat
        • S(F)
      • Vars
        • R(b);N_GUARD,XR(A)::QAR1(C),XR(c)
        • S(m);XQ(C)::S(D),XS(m)
        • R(b);N_GUARD::QAR1(C),XR(c)
      • Refutation
        • Q(j);
    • Try
      • Q(C);CHECK,XP(h)
      • Vars
        • B(k);P_SPINB(k)::S(F)
        • B(l);P_SPINB(l),XQ(C)::S(F)
      • Refutation
        • S(m);CHECK,P_SPINS(m),XQ(C)
  • Actual
    • Q(C);
    • Threat
      • S(F)
    • Vars
      • Q(j);CHECK,N_GUARD::S(F),XQ(j)
      • R(b);OGATE,XR(A)::QAB1(C),XR(b)
      • R(b);N_GUARD::R1(A),XR(b)
      • P(h);S_CUTB(k)::B(B),XP(f)
      • Q(j);N_GUARD::R1(A),XQ(j)
      • S(m);N_GUARD::S(D),XS(m)
      • P(h);S_CUTQ(j)::R1(A)
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